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12-11-2023, 12:02 PM
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#1
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Montana Master
Join Date: May 2018
Location: livingston,tx
Posts: 558
M.O.C. #21685
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Black tank flush valve
What is the replacement valve for the black tank flush valve under the bathroom sink? 
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12-11-2023, 12:17 PM
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#2
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Montana Master
Join Date: Jan 2018
Location: Austin
Posts: 2,423
M.O.C. #21044
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Do you mean the anti-siphon valve?
The screen shots below are from this thread...
https://www.montanaowners.com/forums...ad.php?t=72875
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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12-11-2023, 12:54 PM
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#3
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,933
M.O.C. #20477
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Kyle,
Many simply delete the valve and just connect the two lines together.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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12-11-2023, 01:13 PM
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#4
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,953
M.O.C. #5651
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I had the black one on top right. I just took it apart and removed the little marble inside. The marble would slide one way which had a fitting to stop complete closure. The other direction it would completely cover the pipe opening. No need to replace the whole thing if you have the black one.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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12-11-2023, 05:16 PM
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#5
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,701
M.O.C. #24086
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The black tank flush is mounted to the front of the black tank. If you remove the anti siphon vacuum breaker, and you are going down the road and if you Slam on the brakes, EVERYTHING in the black tank goes forward. Water weighs 8 lbs per gallon. All of it is forced back through the pipe (hydraulic action) and without a valve in there it could all end up in the convenience center.
I recently had the bottom off to replace the black tank valve seal.
Picture of the flush connection at the front of the black tank. The connector was loose. I tightened it up about two turns.
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12-11-2023, 09:19 PM
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#6
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Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 954
M.O.C. #19630
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The air gap is not a back flow prevention device like a check valve. "IF" you could stop hard enough to force water from the black water tank back through the line it would come spewing out of the air gap and into the area surrounding the line. I just removed the air gap and connected the lines together and installed a ball valve connector on the flush line in the convenience center.
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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12-12-2023, 06:18 AM
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#7
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Montana Master
Join Date: May 2018
Location: livingston,tx
Posts: 558
M.O.C. #21685
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Quote:
Originally Posted by Mikendebbie
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Yes sir that is what I was looking for, thank you.
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