2pcs/pack Check valve to stop water from flowing in the wrong direction and accidentally 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