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Thank you for that ARJ - so this is only supposed to be a one way valve. If you turn on an exhaust fan and smell something coming from that valve (in place) it is faulty.
It also appears to be at a high point where fluids should never be at.
A person should carry a spare one of those for sure.
I'm not sure I understand that diagram, it looks closed off to me.
Would it still be to code running that line to the stack?
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