Marina Plastic Check Valve

Perfect valve to have between my CO2 canister and ladder. Inexpensive and doesn't appear to restrict flow. Lots of bubbles. (Even though the Hagen Nutrafin CO2 system does not require you to use a check valve, it's good to have one in place if you're canister isn't at tank level).

Check valves are a must if you're running your air pump lower than your fish tanks. My pump is located in the cellar with fish tanks on the first and second floors. Damage to your pump can result when you don't have a check valve. Highly recommended product at reasonable price.

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Good, Made Well, Woks Well, Does The Job, Performs As Stated. Why do I have to Write More It's Just a Stupid Check Valve!

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power has not gone off, so the valve has not really been used. So far so good not havine any problems.

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I purchased it for my 10 gallon tank. Ignored other reviews thinking its just a non-return-valve, how bad it could be. This thing didn't even lasted 3 weeks 19 days to be precise. Very disappointed.