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queball753 11-20-2012 03:57 PM

Question about check valves
I am doing the DIY CO2 method for my fish tank. This forum has been awesome, but I just have one question. I bought a check valve, one side says in the other says out. Am I correct that the "in" side should be closest to the Yeast bottle?

nvladik 11-20-2012 04:38 PM

Sounds about right....

Edub 11-20-2012 05:08 PM

Mine has little arrows on it indicating the flow. Point the arrows away from your yeast and into your tank.

If your's just says "in" and "out" then yes, i'd say the "in" side is the yeast side and the "out" side goes to your tank.

Hmoobthor 11-20-2012 05:16 PM

try it which ever way...if there is no bubble.... switch that baby around and ur set

snakeplisken 11-20-2012 09:51 PM

just blow into it...

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