Quote:
Originally Posted by rohrmann
The problem is not the individual fixtures but is the tanks themselves. When you have a valve open, sewer gases enter the tanks from the park's sewer system and will exit out the vent pipes at the roof and then can get into the rig through open ceiling vents or open windows or doors. When walking around an RV park, it is quite obvious where the rigs are that have their valves open.
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Exactly true. Making a P trap in your sewer hose is super easy and good insurance against those stinky sewer gasses.