Check valve to stop water from flowing in the wrong direction and accidently draining an aquarium in the event of an air pump failure.

• 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
• not suitable for Pressurized Co2 system