These are the highest quality industrial-grade Brass Check Valve from German Air Pressure Systems.
Just like you, we also thought that these were unnecessarily overkill for aquaristic purposes, but it has been proven that these are the only qualified Check Valves for protecting your expensive CO2 equipment (Regulator & Cylinders) from saltwater with a pressurized Kalkreaktor pushing it backward vigorously.
Takes 4/6 mm (ID/OD) or 1/8" airline tubing.
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Fair Review by PlantFarmer
I've used this check valve for over 5 yrs. It has let water pass by many times (as others do) For me, the water was passing by while in the horizontal position. My fix is to orientate the valve in the vertical position. So far this has worked. (Posted on 11/14/2015)
Best Ever! Review by Hoang
Hands down best check valve ever! You truly get what you pay for. (Posted on 5/23/2011)