The Planted Tank Forum - View Single Post - high pressure co2 lines/check valves
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post #9 of (permalink) Old 09-28-2012, 06:29 PM
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Join Date: Feb 2009
Location: San Francisco
Posts: 2,530
no water pass to the other side of the check valve, that means the check valve does its job.

leak at where the air hose meets check valve hose barb, the problem is the air hose.
regular vinyl air hose normally gets harden in 2-3 years, under UV, even faster.
and normal fish store quality vinyl air hose has low working pressure rating(burst rating is about 2-3times of the working pressure), use it with 40 psi of air you are actually pushing the working pressure limit.
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