Limits the flow of gas to one direction only. Use a check valve between the bubbler and generator to prevent unwanted pressure build up in the generator, and a safety against a low level bubbler. A check valve, such as used on torches, is recommended.
A valve which will allow water to pass in one direction but will close and prevent flow (backflow) in the opposite direction.
A valve that closes to prevent backward flow of liquid
A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.
A small area of still water, typically one formed naturally
A small, shallow patch of liquid lying on a surface
an excavation that is (usually) filled with water
A swimming pool
join or form a pool of people
combine into a common fund; "We pooled resources"
Well head and connections
2" galvanized pipe well head / nipple / 2" tee (to pool pump) / reducer bushing / nipple / brass check valve / PVC PIPE: male adapter, pipe, repair coupling, pipe....