Montana Owners Club - Keystone Montana 5th Wheel Forum - View Single Post

**DQDick** · 10-08-2020, 02:37 PM

If you can't find anything leaking the next thing to check is the backflow preventor, normally located under the bathroom sink. They will only leak when you flush the black tank, but they are well known for doing it. If that's the case many have replaced them with a good one from a box store and some of us have eliminated them altogether and use an exterior one when we hook up to flush.

10-08-2020, 02:37 PM	#8
DQDick Site Team Join Date: Jun 2011 Location: Wilsey Posts: 18,799 M.O.C. #11455	If you can't find anything leaking the next thing to check is the backflow preventor, normally located under the bathroom sink. They will only leak when you flush the black tank, but they are well known for doing it. If that's the case many have replaced them with a good one from a box store and some of us have eliminated them altogether and use an exterior one when we hook up to flush. __________________ 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.