Holding Tank Vent
Rich posted a long thread about sewer smell in the coach, that I believe ended up being the galley sewer line vent located at the end of the island accessed through the inspection plate on his 3400RL.
I FOUND ANOTHER ONE!
Took the inspection plates off of our garden tub in the 3400RL to check fittings, and noticed another black pipe extending up into nowhere within the wall of the tub. It's another vent for the gray tank. I am real glad I checked, as I also noticed it was just an open pipe, and the vent was unscrewed laying on the floor next to it. Wouldn't that be a surprise when you pulled the drain plug in the bathtub (maybe). Anyway, its behind the center inspection plate.
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