What's everyone's CO2 check valve recommendation?
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Check Valve
- Thread starter Unexpected
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I've just bought one of these and am very impressed. It's so solidly made (German), and I love the fact that it has stainless steel screw up hose fittings for security. My goodness is it heavy though. Definitely needs some sort of support for its mass, not just letting your CO2 tubing take the strain.
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So far these have been bulletproof 
www.bulkreefsupply.com
Mur-lok Inline Check Valve 1/4" x 1/4" Push Connect
Mur-lok RO fittings are the only RO fittings that feature dual EPDM O-rings to ensure a straight leak free fit. We believe GA Murdock Mur-lok fittings to be the best so strongly that we use them virtually exclusively on each of our BulkReefSupply.com reverse osmosis units and BRS media reactors...
www.bulkreefsupply.com
Kwyet 447
After every new tank—“This is my last one!”
I’m using this. It works very well.
www.aquariumcoop.com
Stainless Steel Check Valve for Planted Aquarium CO2 Systems
Stop water from leaking & damaging your CO2 regulator when the power is off. Made with stainless steel for greater durability and to handle high pressures.
www.aquariumcoop.com
Also, ALWAYS have two check-valves installed inline together with a clear tubing. If you see water in the middle section of tubing between the check valves, the first one has failed. Save your expensive regulators with cheap check valves!
