Might be an air admittance valve. Those are usually used when venting to the roof isn’t possible or practical.
Plumbing is one of those things that’s sort of an art. You can do a whole bunch of shit wrong and have it still technically function properly. Nobody will know except you and the next person who actually knows what they’re looking at.
Might be an air admittance valve. Those are usually used when venting to the roof isn’t possible or practical.
Plumbing is one of those things that’s sort of an art. You can do a whole bunch of shit wrong and have it still technically function properly. Nobody will know except you and the next person who actually knows what they’re looking at.
It’s surprising how much depth there is to plumbing. And alarming how easy it is to become overconfident that one has it mostly figured out.