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Old 12-12-2019, 09:12 PM   #1
Seasoned Camper
Join Date: Oct 2018
Posts: 68
M.O.C. #22842
Location of the Vacuum Breaker/Check Valve

Can someone tell me where the vacuum breaker is located in a 2011 3400RL. It's not under the bathroom sink and I can't find a trap door in the wall of the pantry which is behind the shower wall. I really don't want to start cutting holes looking for it, if I can help it. Appreciate any help.

I tried using the black tank cleaning sprayer and there was water leaking under the trailer and I couldn't hear it spraying on the walls of the black tank.
Bob & Sharon
Midlothian, Tx.
2011 Montana 3400RL Hickory Edition
2006 GMC Sierra 2500HD
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Old 12-12-2019, 09:23 PM   #2
Montana Master
Join Date: Jan 2016
Location: STAYTON
Posts: 829
M.O.C. #18157
Take one of your basement wall panels down, and see if you can see where they put it. The water line from the tank and the line from the convenience center should go up the same hole.


2016 3610/2012 F-350 Powerstroke
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Old 12-13-2019, 12:15 AM   #3
Montana Master
rohrmann's Avatar
Join Date: Oct 2012
Location: Box Elder
Posts: 2,907
M.O.C. #12947
Our rig is similar to yours and the valve is between the shower wall and the back wall of the pantry on ours. We have a pocket door at the steps going up to the bath/bed area and I have seen the valve by closing the pocket door and looking past the door into the space between the shower and cabinet. If I ever needed to replace the valve, I would have to cut an access hole into the back of the pantry, and then cover the hole when done with the valve.
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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Old 12-13-2019, 08:25 AM   #4
Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 5,303
M.O.C. #6433
Different model, but ours is also between the shower wall and the entry closet/pantry where the pocket door opens. I found the location by looking in the basement under the shower and seeing 4 water pipes going up to the shower. Since the shower only needs 2 pipes, that was a pretty good indication the other 2 were the flush valve.
The back wall of my entry closet does have a square opening with a plastic cover on the back wall. But neither the valve nor the shower faucet was behind it. But leaning in and looking down I could see the flush valve down and to the left. Had to cut a new opening.
Bill & Patricia

2007 3075RL
2012 F350 SRW CC LB FX4 6.7
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