Airline check valve - non return valve
Check valves or non return valves are used as a safety feacture and help prevent water back syphoning when power is cut, resulting in damage to the air pump. They should be used at all times when an airpump is placed underneath the aquarium. The seal inside is one way and should be put in the airline near to the aquarium. With the pointed black end facing the aquarium.
SKU: Airline check valve - non return valve