Check valve to stop water from flowing in the wrong direction and accidentally draining an aquarium in the event of an air pump failure.
2 x Red Air Check Valve
Keep air flowing in the right direction and stop water from flowing out of the tank
Use the air check valve as a safety precaution whenever using air pumps
Use with aquarium air line tubing and an air pump to allow air out and keep water from flowing back
Content: 2 x Non-Return Valves