There actually is a p-trap, which works 95% of the time, just not when
the kitchen faucet is run, and occasionally it will fail just by itself
(I'm figuring it just empties through evaporation).
Are you saying that there is a p-trap under the floor or in the
Because that grey curved pipe I see on the left is not a p-trap and
won't keep the odor out. The curved part should hang toward the
floor, not swing on the side.
You can see an example here:
Looks to me like it does curve toward the floor.
And while it's a little shallow, it would probably
work fine if it were vented on the downstream side.
(by vented, I mean connected to a vent stack,
not poking a hole in it.)
And you're right, sorry. I was seeing a floor behind the pipe but
that's a wall. My bad. I agree, that should work.
Perhaps the OP could divert the AC drain to a large container for a few
days and make sure to close off the part going in the wall. If the
odor disappears the pipe is the problem.
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