Forum Discussion
opnspaces
Feb 14, 2023Navigator II
All drains except the toilet need some kind of venting after the P trap to avoid a siphon effect draining the trap. Look under the sinks at the P trap and you should see a vertical T. The top of the T will either be connected to the vent pipe to the roof or terminate about a foot above the trap. If it terminates you can reach up and unscrew the AAV and see if air passes in both directions. The AAV is a one way valve letting air into the tank but not letting the air and stink back out of the tank. If you can pass air both directions replace the valve.
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