I wouldn't use a brass check valve in a saltwater application.
Dennerle makes a CO2 check valve made of plastic. It doesn't seem to be listed on the Ocean Aquatics website but that's where I got mine. Call Wendell and ask for one.
It looks like this:
http://www.aquacave.com/dennerle-hig...alve-1581.html
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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