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On this page, you find our selection of check valves for use in pneumatic systems. By using pneumatic check valves, you can ensure a one-way air flow in the system and thereby protect the pipes and other components. This is also the page to search if you are on the hunt for a nipple with a built-in check valve. All nipples with check valves are made of brass and have a push-in connection that fit various thread types and thread sizes.