Before you do anything look on Amazon or wherever and see what a hepvo valve looks like and then look in the ceiling below your shower and see if you have one. Both of my Monty's have had them in the drain line somewhere and if you try to clean the drain with a snake you'll break them and then sewer smell will be able to come back into the rig. You can guess how I know. If you do, you'll need to either replace it or clean it gently with a soft bottle brush. I'm not sure when they started using them, but I know they are on every rig since 2010.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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