Check Valve

Aquarium Co-Op

$ 1.99 

We use these check valves to keep water from siphoning out of the tank when the power is out. We also use these check valves on our co2 systems. They are made with a rubber flapper instead of a spring like some of the cheaper ones. With co2 they do break down over time we find we get 3-5 years of use out of one.