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Correct Fitting of Non Return Valve

1 reply [Last post]
super7star's picture
Joined: 07.04.2010

Hi there

I wonder if someone could help. I am setting up a fish tank with pump and a non return check valve, this one:


I'm not sure which way around the valve should be fitted, should the black end connect to the airline coming from out of the water or is it the other way around?

Sorry if this is a dumb question!