Airline Check Valve Pack of 5

The Airline Check Valve Pack of 5 provides five non-return check valves for hobbyists running multiple tanks or building out a fish room aeration system, offering the essential back-siphon protection needed on every pump outlet at a cost-effective per-unit price. Each valve works identically to a single check valve — an internal flap allows air to flow toward the tank but closes immediately when pump pressure stops, preventing water from siphoning back into the pump.

With five units per pack, this is an ideal solution for those with a 4-outlet or 6-outlet pump where each individual airline line requires its own check valve. Fitting a check valve on every line provides comprehensive protection regardless of which device happens to be lower than the pump during a power failure.

The valves are compact, transparent, and fit all standard 4mm airline tubing. A flow direction arrow on the body ensures correct installation orientation. Keeping one or two spares from the pack is recommended, as check valve flaps can wear and should be replaced annually as part of routine maintenance.