Bad odor in the KITCHEN when taking a shower in the BATHROOM
Starting just last weekend on our most recent trip with the Toy Hauler, the following would happen. I would take a shower in the bathroom with a door on it. I'd finish everything I was doing and the...
The air admittance valve like Dutch_12078 posted is in the cabinet under the sink by the P trap. If failed it will let smell out regardless of water in the trap. It's also fairly inexpensive at just under six dollars. Link