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12-06-2020, 08:07 PM
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#1
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New Member
Join Date: Nov 2020
Location: Harlingen
Posts: 5
M.O.C. #27470
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Mystery Pipe Behind wall
Hi! I'm new to the forum and have really found this to be a life saver. I am hoping someone can help me out. I just bought a 2008 Keystone Montana 3400RL and is in the process of renovating it. I came across an access panel in the pantry. When I looked in there and closed the door to the bedroom it revealed two pipes back there. They appear to be broken. I have never seen pipes that looks like this and was hoping you all could tell me what it is and if I can fix it or if I need to find a plumber to fix it. TIA
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2008 Keystone Montana 3400RL
Texas
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12-06-2020, 08:13 PM
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#2
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Montana Master
Join Date: Jul 2009
Location: Olympia
Posts: 1,058
M.O.C. #9441
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Vacuum breaker for tank flush. Looks like it is under stress and needs to be adjusted a little otherwise the replacement will break also.
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2020 Ram 3500, 2022 Luxe 38GFB,2500w Solar with Victron equipment, Gen Y Pinbox
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12-06-2020, 08:14 PM
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#3
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,172
M.O.C. #6433
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That is your black tank flush anti siphon valve. Mine broke exactly like that. DO NOT USE YOUR BLACK TANK FLUSH or you will flood your trailer. You need to 1) replace that clear valve with a better brass one, or 2) eliminate the valve altogether by buying fittings and connect the pipes together and throw that valve away.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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12-06-2020, 08:20 PM
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#4
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,172
M.O.C. #6433
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__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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12-06-2020, 08:22 PM
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#5
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Many of us have spliced those tubes together and eliminated the valve. We then use an external backflow preventor before the water enters the black tank flush.
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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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12-06-2020, 09:09 PM
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#6
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Montana Master
Join Date: Jul 2020
Location: Battleford
Posts: 627
M.O.C. #26690
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Is this something that may be an issue on newer units also? (2021 3790RD)
Thanks,
Brad
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12-06-2020, 10:01 PM
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#7
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Montana Master
Join Date: Mar 2020
Location: Lamesa
Posts: 621
M.O.C. #26010
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Quote:
Originally Posted by kowbra
Is this something that may be an issue on newer units also? (2021 3790RD)
Thanks,
Brad
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They can be an issue on most anything they are installed on. Like was mentioned earlier, a 90 degree shark bite fitting (or 2) and take it out.
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Danny and Susan wife of 55 years
2019 Ram Laramie 3500 6.4 4x4 CC 4.10 SRW
2020 Montana High Country 331RL
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12-07-2020, 03:24 AM
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#8
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,143
M.O.C. #25165
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Our 2019 3791RD had a black plastic one under the bathroom sink. It leaked within 3 months of getting our unit. I cut it out and used 2 shark bite elbows to put the pipe back together, then got a hose bib style backflow preventer/vacuum breaker that screws into the inlet on the black tank flush. I think I ordered on amazon for about $5 or less. If memory serves, the valve had to be installed above the height of the toilet to work properly, which is why it is under the sink, or in the wall in your case.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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12-07-2020, 08:39 AM
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#9
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,172
M.O.C. #6433
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Quote:
Originally Posted by kowbra
Is this something that may be an issue on newer units also? (2021 3790RD)
Thanks,
Brad
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I would guess they are still using the same cheap problematic valves they have for years. At least a couple have posted here that theirs leaked due to bugs getting into the valve via the atmospheric vent cap, not because the valve itself failed.
I would suggest that at some point you eliminate that valve, join the pipes together, and use an external anti siphon/vacuum breaker valve. That valve is installed to meet NFPA 1192 Standard for Recreational Vehicles.
https://www.lowes.com/pd/AMERICAN-VA...reaker/3353894
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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12-07-2020, 09:59 AM
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#10
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Montana Master
Join Date: Jul 2020
Location: Battleford
Posts: 627
M.O.C. #26690
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Quote:
Originally Posted by BB_TX
I would guess they are still using the same cheap problematic valves they have for years. At least a couple have posted here that theirs leaked due to bugs getting into the valve via the atmospheric vent cap, not because the valve itself failed.
I would suggest that at some point you eliminate that valve, join the pipes together, and use an external anti siphon/vacuum breaker valve. That valve is installed to meet NFPA 1192 Standard for Recreational Vehicles.
https://www.lowes.com/pd/AMERICAN-VA...reaker/3353894 |
Great, thanks!
Brad
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12-07-2020, 11:07 PM
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#11
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,320
M.O.C. #17894
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I would find the 2 pipes from below in the basement. Cut both pipes off and plumb them together with shark bite fittings to eliminate the valve. As someone else said DO NOT USE YOUR BLACK TANK FLUSH or you will flood your camper.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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12-08-2020, 04:22 AM
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#12
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New Member
Join Date: Nov 2020
Location: Harlingen
Posts: 5
M.O.C. #27470
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Thanks everyone. This has been so helpful.
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2008 Keystone Montana 3400RL
Texas
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12-08-2020, 07:12 AM
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#13
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Montana Master
Join Date: Aug 2012
Location: Northport
Posts: 624
M.O.C. #12724
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I would not cut and tie lines together in the basement. There needs to be a loop in the line that is higher than black tank. With out the loop black water will wont to run out the bib connection. Sure a one way bib would prevent this but I wouldn't trust it.
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Paul Northport,AL W4XH
2013 358 RLT Mountaineer
2008 Silverado Duramax
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12-08-2020, 10:04 AM
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#14
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,953
M.O.C. #5651
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My 2013 had a back flow valve under the bathroom sink. It leaked, and when I took it apart, it was nothing but a little marble that would back up against the intake line and shut it off from back flowing. I just removed the marble and no more leaks.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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12-09-2020, 04:50 PM
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#15
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Established Member
Join Date: Dec 2009
Location: Maple Grove
Posts: 28
M.O.C. #9990
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Quote:
Originally Posted by Dolly'sgirl
Hi! I'm new to the forum and have really found this to be a life saver. I am hoping someone can help me out. I just bought a 2008 Keystone Montana 3400RL and is in the process of renovating it. I came across an access panel in the pantry. When I looked in there and closed the door to the bedroom it revealed two pipes back there. They appear to be broken. I have never seen pipes that looks like this and was hoping you all could tell me what it is and if I can fix it or if I need to find a plumber to fix it. TIA
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It's a back pressure flow
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