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05-22-2022, 02:14 PM
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#1
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Established Member
Join Date: Apr 2019
Location: Bakersfield
Posts: 21
M.O.C. #23754
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Dometic 320 vacuum breaker on toilet
2016 Montana high country 310re.
I've replaced the vacuum breaker on my toilet, but still have issues with the vacuum breaker sticking not allowing water into the toilet.
I've replaced both water valve and vacuum breaker on the toilet.
I can turn the water on and off on the sink next to the toilet, to bring the toilet back to life.
Any idea what might be happening!
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05-22-2022, 02:21 PM
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#2
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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Have been using.the domestic 320 for years with zero issues...but we also use an adjustable pressure regulator on the water line into the rv, as we note pressures from all over the range across the country. We are full timers so our toilet sees use 365. You may well be having issues if not using a true regulated device. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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05-22-2022, 04:10 PM
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#3
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,708
M.O.C. #24086
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I have a Thetford. The vacuum breaker on the back of the toilet has leaked twice. I replaced it the first time. Second time I plugged the top vent hole where it was leaking out. No more leaks.
Honestly I don't know why they have a vacuum breaker on a toilet bowl???
Probably some code ...
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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05-23-2022, 08:21 AM
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#4
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,956
M.O.C. #5651
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Quote:
Originally Posted by Daryles
I have a Thetford. The vacuum breaker on the back of the toilet has leaked twice. I replaced it the first time. Second time I plugged the top vent hole where it was leaking out. No more leaks.
Honestly I don't know why they have a vacuum breaker on a toilet bowl???
Probably some code ...
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I have a 320. But I have never heard of a vacuum breaker on the toilet!! News to me!
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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05-23-2022, 11:31 AM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,384
M.O.C. #4831
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^^^^^^ Me either ^^^^^^^^
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-23-2022, 12:13 PM
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#6
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,708
M.O.C. #12947
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On the 310, and I'm sure on the 320 also, there is a vacuum breaker, item H in the diagram.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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05-24-2022, 06:34 AM
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#7
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Montana Master
Join Date: Dec 2017
Location: Mountain Home
Posts: 841
M.O.C. #20949
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My Dometic 320 toilet with the seat lid removed.. This is where you WILL FIND a vacuum breaker that leads down to the toilet pedal water shutoff valve...
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05-24-2022, 06:39 AM
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#8
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Montana Master
Join Date: Dec 2017
Location: Mountain Home
Posts: 841
M.O.C. #20949
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For the OP since you have replaced both the pedal shutoff valve and backflow valve on the 320 toilet I would have to remove the line from the pedal valve going up to the backflow valve and.. with a container gently operate the pedal valve and see if water flows out of the pedal valve into the container..
If Yes then issue is a sticking or deflective backflow valve behind the toilet even though you changed it... OR.. some sort of obstruction where the backflow valve line feeds into the backside of the toilet so that water can flow out of the toilet bowl holes
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05-24-2022, 08:06 AM
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#9
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,255
M.O.C. #30417
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Quote:
Originally Posted by rohrmann
On the 310, and I'm sure on the 320 also, there is a vacuum breaker, item H in the diagram.
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And what function does this contraption do?
__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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05-24-2022, 05:57 PM
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#10
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,708
M.O.C. #24086
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Quote:
Originally Posted by Foldbak
And what function does this contraption do?
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Leak....
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05-24-2022, 06:49 PM
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#11
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,255
M.O.C. #30417
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Quote:
Originally Posted by Daryles
Leak....
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__________________
Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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05-25-2022, 06:14 AM
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#12
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Montana Master
Join Date: Dec 2017
Location: Mountain Home
Posts: 841
M.O.C. #20949
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Quote:
Originally Posted by Foldbak
And what function does this contraption do?
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Vacuum breaker on the backside of the toilet is to prevent backflow of water from toilet into the water system ... required by code...
The one on the toliet is usually very reliable provided if you winterize you make sure this valve is either blown out or RV antifreeze used...
The anti siphon valve for the black tank flush is a complete piece of junk and should be either upgraded to an all brass one or eliminated by the owner before you have a flood in your RV
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