A check valve to prevent water from flowing in the wrong direction. Helps to prevent accidents such as aquarium draining caused by air pump failures.
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