I did not know I had one when I first got the Montana. However, when I was at the bedroom sink I could hear water dribbling into the gray tank and the sound was coming from the shower drain. When I removed the hepvo thing there was nothing inside the tube. The PO must have tried cleaning it the wrong way and pulled out the guts. I put in a new one and all is good.
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2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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