The Planted Tank Forum - View Single Post - Question about check valves
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Old 11-20-2012, 04:57 PM   #1
queball753
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Default 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?
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