Schlenk line vacuum. McCormick Last Update: February 20, 2009 Introduction A schematic diagram of the Schlenk line in MG 1026 is shown in Fig. First pioneered in 1913 by Wilhelm Schlenk, the apparatus and techniques used today have evolved considerably, allowing more challenging and sensitive synthetic chemistry to be carried out on a routine basis. This may also lead to condensation of liquid oxygen in the solvent trap. Obtain a condenser with a suitable ground glass joint which will fit the Schlenk tube. Aug 6, 2013 · Vacuum/inert gas manifold systems, commonly called Schlenk lines, are ideal for handling compounds that react with O 2, water, or CO 2. Selecting the appropriate pump is crucial for achieving the necessary vacuum levels, ensuring the 4-Port Vacuum Manifold, Right Handed Trap Assembly, Double Bank, Airfree, Schlenk. Close the air bleed Solvent Distillation Vacuum Cart System, Portable Vacuum Gauges Vacuum Manifolds Schlenk Line Vacuum Pumps Vacuum Traps Sort Jul 2, 2013 · Schlenk flasks have a tap to connect the apparatus to the Schlenk line and control the access to inert gas or vacuum, while a three-necked flask requires an additional adaptor for this purpose. This page discusses removing solvents using a Schlenk line describes steps to safely evaporate solvents under vacuum without exposure to air. A Schlenk Line is a tubular glass apparatus commonly used in chemistry or material laboratory research to carry out experiments under a vacuum and an inert atmosphere (like nitrogen or argon). Both tubes are 1/2” OD with serrated hose connections located on the upper left and lower right banks. Borys published An Illustrated Guide to Schlenk Line Techniques | Find, read and cite all the research you need on ResearchGate A Schlenk flask, distillation bridge and Schlenk cap are greased, assembled and cycled onto the Schlenk line. The guide covers the basic setup, operation, and safety procedures required to use the Schlenk line effectively. Most Schlenk lines employ rubber tubing to connect the taps on the manifold to other glassware. Cycling a reflux condenser onto… Page Size Per Page InStock AF-0305 GAUGE SHELVES, AIRFREE®, SCHLENK From $150. Feb 13, 2023 · A Schlenk line (Figure 1 a) is dual manifold system in which the vacuum manifold is connected to a vacuum pump, while the inert gas manifold is connected to a source of purified and dry inert gas (typically nitrogen or argon; see section for details about Schlenk line setup and equipment selection). Jan 11, 2002 · A way of delineating these would be to use the terms "Schlenk line" and "High vacuum line". When using the Vacuum line nitor piece. The pressure reading is about 800 militorr. 55 Laboy Glass is a company that specializes in the production of lab glassware and equipment. The content is intended to provide safe operational practices currently believed to represent best practices in the use Feb 8, 2024 · An inert manifold (Schlenk line) consists of an array of taps connecting two gas/vacuum lines to tubing for connection to various flasks and reactors. , the regulator supply pressure to the desired fumehood is 0. Note: The style of distillation bridge (single-piece) illustrated is designed specifically to purify high-boiling liquids under high-vacuum. A vacuum glass manifold is commonly used in a Schlenk line, which refers to a chemistry apparatus created by Wilmhelm Schlenk. with front-left and rear-right 10 mm hose connections. At the present time it is not truly a Schlenk line because we have no pump attached to the vacuum manifold and we have no mercury bubbler. Cycling a J. Our pumps provide a reliable vacuum source for a variety of laboratory and industrial applications. 50 *In-Stock AF-0452 VACUUM MANIFOLDS, INERT LINES, 4-PORTS, AIRFREE®, SCHLENK LINE From $2,377. 舒伦克线，也可称为 施伦克线 （英文： Schlenk line, vacuum gas manifold），是一种由德国化学家 威廉·舒伦克 （Wilhelm Schlenk）发明的实验室常用化学仪器。它的核心部件一根带有多个通气接口的玻璃双排管 [1]。双排管中的一根与装有惰性气体（实验室一般使用 氮气 或 氩气）的气体钢瓶相连，为连接在 General purpose double bank vacuum manifold with 3, 4, or 5 ports for use with vacuum and inert gas. Vacuum grease is low volatility lubricant which is used to provide a uniform and airtight seal between ground glass joints. Their design allows compounds to be handled and reactions to be performed under an inert atmosphere of argon or nitrogen. Step 1: Cycle a J. And membrane pumps are incredible robust. Cycling a solvent ampoule onto the Schlenk line. The exact requirements for setting up a Schlenk line ready for use will vary depending on the design of the specific line and personal preferences. Cycling a Teflon tapped ampoule onto the Schlenk line. Two thick glass cold traps precede the main manifold section, serving to condense any vapors into a solid to prevent any buildup inside the vacuum pumps. Use of the Schlenk Line Ensure that the vacuum pump is on (the switch is located on the back of the pump, which is in the cabinet under the hood), the cabinet door is open, and the compressed cylinder gas is not empty (i. well‐maintained Schlenk line will allow you to do the following: flame dry glassware, vacuum distillation, freeze‐pump‐thaw degassing, removal of residual solvent, vacuum transfer purification, and run a reaction under an inert or reagent gas. Step 2: Once cycled onto the line, replace the Teflon tap with a rubber septum under a positive pressure of inert gas. A thermometer adapter or a rubber septum with a 5 mm hole at the bottom of the adapter provide a sufficiently air-tight seal. The vacuum is used to remove air or other gasses present in closed, connected glassware to the line. Hydrogenations, Grignard reactions, pyrophoric manipulations, air and/or moisture sensitive chemicals are easily handled using SL techniques. AF-0062 VACUUM MANIFOLDS, INERT GAS, SOUZA, AIRFREE®, SCHLENK From $2,418. It Find the right Welch vacuum pump for your vacuum manifold. The illustrations and graphics created for the Schlenk Line Survival Guide can be downloaded below. Distance between two adjacent ports is 127 mm (5 in), with a total manifold length of 635 mm (25 in). The books by Shriver and the last chapter in Brown's book are especially recommended since they should give an overview of almost all the techniques one would have to learn. A custom Schlenk line is likely to cost around $5k-10k, but there are many affordable ones that are maybe a little less fancy but still very functional. 83 Add to Cart Laboy Glass Laboy Glass Singe Bank Vacuum Maniflod For Schlenk Line Air-Free Chemistry Lab Glassware Air-Free Chemistry Lab Glassware Starting at $120. Evacuating the headspace under dynamic vacuum. Standard ground-glass joints can be connected with the appropriate size of inlet adaptor, but several other types of connection exist. Orient the clamp so that the weight of the Schlenk line is supported by the bottom (the non-moving arm) of the clamp The Schlenk line, sometimes referred to as vacuum gas manifold, is a chemistry apparatus widely used in air-free techniques. It is recommended to secure the Schlenk line at a comfortable height with at least three clamps, securing both the vacuum and inert gas manifold to prevent slippage or tilting. Ideally a socket/stopper Schlenk tube should be used as a condenser is designed to be used with the cone end at the bottom. Ports have #15 o-ring joints and are spaced 100mm center to center while the manifold has an overall length of 410mm. The effectiveness of a Schlenk line setup heavily relies on the quality and suitability of its vacuum pump. Hg Schlenk line Residual drying and working in the absence of moisture and oxygen requires a deep ultimate vacuum. Young’s NMR tube onto the Schlenk line. Before opening your reaction to vacuum, place dewars filled with liquid nitrogen experiment. Young’s NMR tube onto the Schlenk line with a minimum of three vacuum/inert gas cycles using an appropriate NMR tube adapter. 4-Port Vacuum Manifold, Double Bank, Airfree/Inert Line, Schlenk, Complete. The valves are sealed to either the vacuum or inert gas side of the manifold and then bent to a 90º angle, forming a strong but very compact assembly. Nov 23, 2021 · A Schlenk Line is a tubular glass apparatus commonly used in chemistry or material laboratory research to carry out experiments under a vacuum and an inert atmosphere (like nitrogen or argon). This double bank vacuum manifold, also known as a Schlenk line, is designed for inert atmosphere work and vacuum line techniques in chemistry and material science laboratories. In this video, we will learn how to use a Schlenk line or vacuum manifold, assessing the hazards of certain methods and common errors. To allow for flexibility in conducting Valves face forward permitting convenient operation of both vacuum and inert gas lines. It is used when samples are sensitive to air/moisture and the vacuum is also often used to remove the last traces of solvent from a sample. He offers valuable tips on selecting the right components and Dec 3, 2014 · The vacuum line begins in a cabinet below the fume hood, starting with a connection to a belt-driven pump, and connects to the Schlenk line via a glass hose on the left. 1: The Schlenk Line This page explains the purpose and use of the Schlenk line in inorganic chemistry. Aug 18, 2025 · For the sonication/vacuum draw instrument apparatus, the sample is placed in a sonicator and attached via the Schlenk line to a low vacuum. A Schlenk Line typically contains a dual glass manifold with Glass Manifolds Glass manifolds, also called vacuum manifolds, are pieces of lab glassware that function as large channels into which other, smaller channels flow. This tutorial, which is The aim of evacuating the Schlenk line is to work as completely as possible in the absence of oxygen and humidity. 01 Add to Cart 1 2 In this video, we will learn how to use a Schlenk line or vacuum manifold, assessing the hazards of certain methods and common errors. If the Schlenk line you are using has both glass tubes open at one end, one of them can be sealed off to create a proper vacuum line. Crude material in a Schlenk flask. For the freeze-pump-thaw instrument apparatus, a liquid nitrogen dewar and a heat block are prepared in addition to the Schlenk line, which is open to the high vacuum. Jun 4, 2013 · The basis of all Schlenk line work, the evacuate-refill cycle, and how to dry and/or degas solvents for air-sensitive reactions Shop Chemglass Vacuum/Inert Lines, 4-Ports, Okuda, Airfree®, Schlenk Line at Thomas Scientific, your trusted partner in Science. Bubblers provide a pressure relief system within the Schlenk line as well as allowing the inert gas flow rate to be easily monitored. For any schlenk lines connected to a high vac, we generally use rubber tubing like this There are lots of different tubing types available, but I generally like silicone tubing for connecting my reactions to my schlenk line (these are what I use for nitrogen, but tend to collapse if used with vacuum. What are the main safety concerns with Schlenk line? Liquid nitrogen The main safety concerns with Schlenk lines are related to the use of liquid nitrogen. Inert Gas Line, 4-Ports, Airfree®, Schlenk Similar to the AF-0450 five-ports line, except that the line is constructed using 0 - 4 mm Chem-VacTM Chem-Cap® valves (A) instead of the greased glass stopcocks on all of the four ports. Cleaner and you don’t have to worry about leaks. We therefore recommend our pumps with an ultimate vacuum in the range of 10 -3 mbar. At Scientific Glass Services, we produce custom made gas and vacuum manifolds to meet the exact requirements of our customers. Bubblers act as a one-way valve to allow gas to escape the inert gas manifold, whilst preventing atmospheric air and moisture contaminating reactions on the Schlenk line. Schlenk lines are dual manifold systems in which the vacuum manifold is connected to a vacuum pump, whilst the inert gas manifold is connected to a sources of purified and dry inert gas (typically nitrogen or argon). Beams are 22 mmO. This one has almost all o-ring joints and Teflon stoppers, which are far superior to grease joints. Schlenk Line and Schlenk Flask: General Tips 1. Distance between stopcocks is 75 mm center to center. 3 This fact sheet is not a substitute for training on the above procedures. What is the recommended pressure for a schlenk line for best degassing?. Flexible and compact, this 4-port line is constructed using CG-474-02, 4mm oblique hollow high vacuum greased stopcocks on all four ports. This includes the ports directly on the manifolds that connect to the vacuum or inert gas source, and the ports underneath the double oblique stopcocks that connect to tubing for flasks. There are lots of different tubing types available, but I generally like silicone tubing for connecting my reactions to my schlenk line (these are what I use for nitrogen, but tend to collapse if used with vacuum. The end cap on the vacuum line is a # 30 o-ring joint while the inert gas line has a # 9 o-ring joint. When the traps are submerged in liquid nitrogen-filled dewars, the They only reach a pressure of 1-10 mbar but while working on a schlenk line you should always work in cycles anyway (3x vacuum, 3x inert gas). Vacuum gauges are typically connected to the vacuum manifold of the Schlenk line through a greaseless O-ring and held securely with a clamping ring. Ports are 4mm high vacuum stopcocks with serrated hose connections. *In-Stock AF-0452 VACUUM MANIFOLDS, INERT LINES, 4-PORTS, AIRFREE®, SCHLENK LINE From $2,377. The apparatuses consist of a glass manifold with stopcocks and a connection to a vacuum source. The low pressures offered by rotary vane vacuum pumps means that even high boiling solvents such as toluene can be removed at room temperature, which may be crucial for the isolation of… Schlenk Line is a tubular glass apparatus commonly used in chemistry or material laboratory research to carry out experiments under a vacuum and an inert atmosphere (like nitrogen or argon). Selecting tubing with adequate wall thickness and suitable material is essential to ensure safe and efficient operation. 3, it provides excellent chemical resistance and thermal stability. Static vacuum distillations (also called vacuum transfers) are frequently employed for the purification and/or drying of small volumes of solvents or liquid reagents with relatively low boiling points (<150 °C). Laboy Glass is a company that specializes in the production of lab glassware and equipment. Welch belt drive pumps are my choice for schlenk lines. It often also removes the last traces of solvent from a sample. The three high-vacuum PTFE stopcocks feature hollow valves that provide superior sealing performance The assembled Schlenk flask is then connected to the Schlenk line hosing and evacuated under vacuum whilst it cools to room temperature. The two manifolds have several ports which are interconnected via double-oblique stopcocks Jul 6, 2025 · Lab Tubing for Schlenk Line and Vacuum Filtration Appropriate lab tubing for Schlenk lines and vacuum filtration must resist collapse under reduced pressure while maintaining chemical compatibility and durability. Aug 2, 2024 · Schlenk Glassware: There are many ways of connecting glassware to a Schlenk manifold. Method A Step 1: Cycle a reflux condenser onto the Schlenk line. 55 AF-0451 VACUUM/INERT MANIFOLD, 4-PORTS, AIRFREE®, SCHLENK LINE From $4,703. It emphasizes the need for careful handling to prevent … Sep 30, 2025 · With 4 mm double oblique, high vacuum hollow glass stopcocks precision ground with corresponding numbers on barrel and plug. This is because the vacuum line must necessarily be a closed system—not open to the air and completely free of leaks. A Schlenk line, often referred to as a vacuum manifold, is composed of a vacuum line connected by several valves to an inert gas line and a port. Oxygen will condense and explode! Vacuum gauges are also extremely useful for monitoring sublimations, vacuum distillations and drying solids under vacuum. Vacuum System (VS) and Schlenk Line (SL) Safety Disclaimer: This Safety Guidelines document/SOP was prepared exclusively for the use of University of Wisconsin-Madison students, staff and faculty engaged in activities related to their education, research, and/or employment. Schlenk Line and Vacuum Pump Set-up Schlenk lines (SLs) are effective and common devices in research laboratories for controlling the reactivity of various chemical manipulations. Evacuate under vacuum. The upper line co Laboy Glass Double Bank Vacuum Gas Manifold with 15# O-Ring Joints and High Vacuum Valves Starting at $494. Two-stage rotary vane pumps and the chemistry-HYBRID pump meet these requirements. Please view the Citing and Permissions page to learn how to correctly use and distribute the resources provided. typical UW Schlenk line. Ports are spaced 85mm center to center. Jan 29, 2023 · PDF | On Jan 29, 2023, Andryj M. They’re way more robust than direct drive and the difference in pump down rate is negligible on schlenk lines. They offer a wide range of products, including jointed glassware, distillation apparatus, vacuum manifolds, and more. Ports are fitted with two 14/20 and two 24/40 inner joints. Ensure that double oblique taps are all closed. lenk line. Feb 20, 2009 · MG 1026 Schlenk Line Operation Author: James M. Keep under vacuum for 3-5 minutes whilst in the cooling bath. Stopcock Ports Tubing: Does the tubing connecting flasks to the stopcock barbed ports need to be vacuum rated (29 in. For any schlenk lines connected to a high vac, we generally use rubber tubing like this For reference, my Schlenk line/manifold has 10mm barbed hose ports for all connections. Schlenk lines, also known as vacuum manifolds, are indispensable tools in synthetic chemistry, allowing researchers to manipulate air and moisture-sensitive compounds with precision. Several types of bubbler are… Vacuum System (VS) and Schlenk Line (SL) Safety Disclaimer: This Safety Guidelines document/SOP was prepared exclusively for the use of University of Wisconsin-Madison students, staff and faculty engaged in activities related to their education, research, and/or employment. After a suitable amount of time (depending on the size of the flask, ~5 minutes for a 100 mL vessel), the Schlenk flask is slowly backfilled with inert gas. We present our selection of vacuum pumps in the store, matched to vacuum measurement requirements, chemical resistance and oil-free operation. But if you’re really rolling in the dough, look into scroll pumps. The end cap on the vacuum line is a #30 o-ring joint while the inert gas line has a #9 o-ring joint instead of the 14/20 standard taper joint. A way of delineating these would be to use the terms "Schlenk line" and "High vacuum line". 1. Do you have any questions about our Schlenk lines are supported by lattice lab frames that are secured to the back wall of the fumehood. An implosion may occur if the Schlenk line or flask, which contains a crack or defect, is placed under dynamic vacuum. 90 Schlenk lines are dual manifold systems in which the vacuum manifold is connected to a vacuum pump, whilst the inert gas manifold is connected to a sources of purified and dry inert gas (typically nitrogen or argon). Several types of bubbler are… Four-port double-manifold made of borosilicate glass and designed with 4mm double hollow high vacuum glass stopcocks on all ports. Step 1: Cycle a solvent ampoule onto the Schlenk line with a minimum of three vacuum/inert gas cycles. However, we can still use it to work under a nominally oxygen-free atmosphere by The vacuum line begins in a cabinet below the fume hood, starting with a connection to a belt-driven pump, and connects to the Schlenk line via a glass hose on the left. Familiarize yourself with the technique by reading one of the recommended references below. Static vacuum distillations often employ custom-made greaseless vessels and distillation bridges which prevents grease contamination in the purified distillate. Of course the membrane pump is a disadvantage if doing sublimations and vacuum destillations but for inert chemistry it works fine if you do it right. This configuration allows direction connection with vessels having the same joint size. The Schlenk tube for reflux should be placed under a nitrogen atmosphere with the stopper attached. When the traps are submerged in liquid nitrogen-filled dewars, the Jun 19, 2025 · The vacuum line of the Schlenk line is, as previously mentioned, the glass tube that is typically sealed at one end. The content is intended to provide safe operational practices currently believed to represent best practices in the use Aug 2, 2024 · Overview: tus in Schlenk technique is the Schlenk manifold, whic consists of two lines: one filled with inert gas (most line is filled with N2 through one of the top ports. Open the line air bleed. I have just set up a schlenk line and want to see if the vacuum I have is satisfactory. These manifolds can be connected to a reaction flask using a double-oblique tap and rubber tubing. 45 AF-0454 VACUUM/INERT LINES, 4-PORTS, OKUDA, AIRFREE®, SCHLENK LINE From $4,949. e. Attach a gas inlet adapter to the top of the condenser, and a Schlenk cap or small round bottom flask to the bottom of the condenser, greasing the male joints and ensuring a uniform seal. Chemistry labs and research facilities, this single manifold vacuum gas distributor is professional-grade glassware for advanced chemical applications! Made from high-quality borosilicate glass (the same material as Pyrex), it can handle thermal shocks up to 200°C/392°F without cracking. Sep 11, 2025 · Which Vacuum Pumps Are Most Recommended for Schlenk Lines? The most recommended vacuum pumps for Schlenk lines are rotary vane pumps, diaphragm pumps, and scroll pumps. 90 *In-Stock AF-0302-02 THERMOCOUPLE ONLY, REPLACEMENT, VACUUM GAUGES Schlenk Lines using gas and vacuum manifolds are a commonly used apparatus in chemistry experimentation. Trap, Vacuum line, Schlenk techniques Trap, Vacuum line, Schlenk techniques Make sure that you never pump air in a cold trap. What are Schlenk and Vacuum Lines? Schlenk lines and vacuum lines provide a means of manipulating pyrophoric and water reactive compounds without the use of a glove box. Step 3 – Pump Once the contents of the Schlenk flask have cooled down or frozen, open the stopcock to evacuate the headspace. Lower vacuum chambers on stopcock are evacuated with a separate hole in the plug in order to hold the plug in the stopcock barrels. However, it is usual to undertake the following steps: Fit the solvent trap to the line. The Schlenk line is an essential laboratory apparatus used for handling air-sensitive chemicals by providing an inert atmosphere (usually nitrogen or argon) and a vacuum system. Schlenk line centrally consists of a gas manifold (for delivering either argon or nitrogen), a vacuum manifold (for evacuating glassware), and a vacuum pump (attached to the vacu. Discover the right vacuum pump for residual drying. Close the tap if necessary to prevent contaminants from enter Nov 7, 2022 · ABSTRACT: Schlenk lines are versatile pieces of laboratory equipment that enable the safe and convenient manipulation of air- and moisture-sensitive compounds. Schlenk lines are useful for manipulating moisture- and air-sensitive compounds. The vacuum line consists May 24, 2022 · The cleaning and care of your vacuum manifold, high vacuum line, and vacuum lines should be even more stringent and frequent. Starting with the valve closest to the pump, slowly open to fill the line with vacuum. A low ultimate vacuum of the vacuum pump is crucial for this. The valve position connects the port to either the vacuum line or the inert gas line. A Schlenk Line typically contains a dual glass manifold with Dec 11, 2024 · Mastering the basics of the Schlenk line is essential for any chemist working with air- and moisture-sensitive compounds. Step 2: A Schlenk flask, distillation bridge and Schlenk cap are greased, assembled and cycled onto the Schlenk line. Either digital monitors or McLeod Gauges are recomme vacuum pump. Andryj Borys, a renowned expert in the field of synthetic chemistry, provides a clear and practical introduction specifically to the vacuum requirements for Schlenk line applications. Schlenk lines (also known as vacuum gas manifolds) are a commonly used piece of chemistry apparatus originally developed by Wilhelm Schlenk. 5 bar at all times, refer to Appendix 2 & 3). Step 1: An oven-dried Step 1 An oven-dried Teflon tapped ampoule with a 90° side-arm, equipped with a stir bar, is cycled onto the Schlenk Line using a suitable O-ring or ground-glass adapter. Schlenk lines allow solvents and other volatiles to be readily removed under vacuum without exposing the reaction vessel to atmospheric air and moisture. D. Requires the use of an AF-0300-14 adapter for connection to the AF-0300-04 trap assembly at the left top bank of the manifold. In this article, Dr. The other articles are somewhat supplementary and pertain to specific types of Vacuum manifolds, also known as Schlenk lines, are used in the final drying stage of samples following rotary evaporation. AF-0450 VACUUM MANIFOLDS, INERT GAS LINES, 5-PORTS, AIRFREE®, SCHLENK LINE DO NOT pull vacuum while a significant amount of solvent (> 5 cm3) is in the flask, the Schlenk line is not meant to remove solvent from reactions – use a rotary evaporator for this. It is cheap and widely available, has a good operating temperature range (-40 to +200 °C) but has limited chemical… Bubblers provide a pressure relief system within the Schlenk line as well as allowing the inert gas flow rate to be easily monitored. Jan 29, 2023 · Schlenk lines are versatile pieces of laboratory equipment that enable the safe and convenient manipulation of air- and moisture-sensitive compounds. Schlenk lines basically consists of a dual manifold with several ports. Silicone grease is the most commonly used grease for Schlenk line chemistry and vacuum applications. This line is constructed using 0-4mm Chem-Vac™ Chem-Cap valves (A). Similar to the AF-0450 5-port line, except that the line is constructed using 0-4mm Chem-Vac™ Chem-Cap® valves (A) instead of the CG-468-02 greased glass stopcocks on all of the 4-ports. The fo r lower p or N2 or vacuum to be applied to the connected glassware. Allow the pump to ballast (pull through air) for a few minutes. Main vacuum line with 4ea 24/40 inner ports (A) having a unique configuration of 0-4mm Chem-Vac Chem-Cap® valves. VACUUM MANIFOLDS, INERT GAS LINES, 5-PORTS, AIRFREE®, SCHLENK LINE Line has 5-ports (A) with 4mm solid double oblique high vacuum stopcocks, CG-468-02, having a constant pressure retaining device, and 24/40 inner joints with hooks just above the grind. Expertly constructed from Borosilicate glass 3. All hose connections have a 10mm small serration and a 11mm large serration. Vacuum lines usually connect to the experimental apparatus with joints, which provide a better seal and vacuum than the simple rubber pressure tubing connections used on Schlenk lines. This tutorial, which is based on The A Schlenk line consists of two separate glass manifolds one under vacuum and one containing an inert gas, such as N₂. Ports are fitted with two 14/20 inner joints and two 24/40 inner joints and are spaced 5" center to center. Close the air bleed Solvent Distillation Vacuum Cart System, Portable Vacuum Gauges Vacuum Manifolds Schlenk Line Vacuum Pumps Vacuum Traps Sort AF-0452 VACUUM MANIFOLDS, INERT LINES, 4-PORTS, AIRFREE®, SCHLENK LINE Flexible and compact, this 4-port line is constructed using CG-474-02, 4mm double oblique hollow high vacuum greased stopcocks on all four ports. spb pp g4dmvx omdytm j8qn lkqdde g8ag ljmjhnp ivbg idgbla4