Stop Valve Water Stop Valve Aquarium Air Pump Check Valve Oxygen Pump

This one-way check valve is not suitable for use in any type of CO2 system. These one-way check valves are suitable for common aquarium air pumpsThese check valves are designed to protect your air pump by preventing aquarium water from back-siphoning during a power outage.Made of durable clear plastic.Air hole diameter: 4mmMaterial:plasticcolour:As ShownPackage Contents:20 x check valveOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.