Feature: 1. Food Grade Silicone Material: Gas check valve and beer pipeline gasket are made of food grade silicone, which is stable and highly resistant to chemicals, oil, acid, gas corrosion, low smoke emission, and wear resistance. Easy to assemble and disassemble to replace the exhaust parts of the beer barrel coupler. 2. Gas Check Valve and Gas Protector: The gas check valve has a flat meniscus outlet and a special concave design, which allows carbon dioxide gas to flow into the connector smoothly, but there will be no leakage or backflow of carbon dioxide or beer gas. The gas check valve is a miniature but essential part of home cooking. 3. Leak Proof Line Gasket: The thick beer line gasket plays a role of sealing. It is firm and does not slide or deform easily. It can effectively prevent the draft beer line from leaking and save your beer. It is compatible with Sankey barrel couplers, D type barrel couplers, etc. Necessary maintenance and replacement. 4. Portable and Leak Proof: The small gas check valve and beer pipe cleaner can be carried to any place such as beer parties, beer competitions, camping and barbecues. Suitable for pockets and handbags. Meet your different needs, help quickly establish a good beer, gas pipeline seal in emergency situations, and avoid any carbon dioxide gas and beer residues. 5. Strong Applicability: Food grade silicone material gas check valve and beer pipeline gasket, no peculiar smell, small but essential replacement parts for household draft beer system, to provide you with double protection, no air leakage, no beer pipeline, quiet, spend a happy beer happy time with friends and family with friends. Specification: Item Type: Check Valve + Gasket Material: Silicone. Package List: 5 x Check Valve5 x Washer Note: Check the airtightness first:If you are not sure about tight connections. Please cover the external connection of the gas check valve and the beer line cleaner with soapy water to avoid small gas leaks that you may not hear. This can help you save a lot of carbon dioxide gas and bring more fun in your home brewing process.