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10-26-2018, 04:17 AM
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#1
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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water leak under bathroom sink . $70K nightmare
There are 2 white water lines,under the bathroom sink ,(actually only 1 line) connected by a black thingamjig that looks like some kind of pressure relief valve possibly. It is leaking out of the cap on top . What is this? I turned off main water valve and it is still leaking. This 2017 Montana 3950BR 5th wheel is turning into a 70,000$ nightmare HELP. The iwners manual as usual is worthless . Can any one tell me what the maximum water pressure is allowed in these rigs . ?
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10-26-2018, 04:24 AM
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#2
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Senior Member
Join Date: Jun 2014
Location: Saint Louis
Posts: 235
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That's the anti-backflow valve for your black tank flush. It's a vacuum breaker. I've only heard of them leaking when using the black tank flush. There's no pressure in that line otherwise. It's a part that is often overlooked during winterizing and cracks. Some have replaced them with a brass valve from the hardware store.
__________________
2012 Ford Expedition EL Limited
2014 Passport 2510RB
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10-26-2018, 04:27 AM
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#3
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Senior Member
Join Date: Feb 2017
Location: Dade City
Posts: 1,039
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I think that is a anti-siphon valve. For the black tank spray system? For the fresh water system? Others will chime in.
The water system should handle upwards of 75psi. IMHO
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10-26-2018, 04:31 AM
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#4
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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OK Thank you ! My flush hose is hooked up, but off Perhaps the valve at the Rv Park connection is leaking i will check it out .
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10-26-2018, 04:52 AM
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#5
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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OK , I pulled the black tank flush hose off the RV park spigot and the valve does indeed have a drip leak . There was a pressure build up in the hose. The leak has now stopped . So I can say that since it is leaking with just a drip it is probably leaking also when washing the black tank . I will try that next . So Jkoler70, Your description rings true .So am I correct thinking this is a vacuum operated check valve which prevents the black water ftom backing up into the flush line ? Also what do I ask the hardware store for ? A vaccum breaker check valve? Thank you very much!!!!.. This forum is my owners manual !!!
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10-26-2018, 05:48 AM
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#6
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,997
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That "thing" is the black tank flush anti-siphon valve. It is a "notorious leaker" and almost everyone who has one either has experienced a leak or will, in the near future, experience a leak. Many of us just don't use the black tank flush, some of us have replaced the valve when it leaks with another of the same type (it'll leak again, trust me on that) or replaced the valve with either two fittings, eliminating the anti-siphon feature, or with an upgrade, brass anti-siphon valve.
It will not leak unless you're actively running water through the black tank flush system. It is only connected to that 1/2" PEX system. It won't leak so long as you don't use the flush, so just be sure your black tank is full when you dump until you get a replacement. I'd suggest an upgrade brass anti-siphon valve from Lowe's. They're located in the "lawn irrigation" section of the store. Cost, about $20. If you buy a replacement, fragile valve like the one that's leaking, it'll cost about $40, so the "upgrade is cheaper"..... YMMV
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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10-26-2018, 05:51 AM
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#7
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 3,015
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Yep it’s the biggest piece of plastic junk ever.. They will fail.. they will also crack if not blown out with air before freezing temps. Then you have a flood.
Take the valve off and go to Lowe’s or Home Depot and buy a brass replacement valve...
I don’t use mine at all because my blac tank line is flat and level so I wash mine form the sewer connection fitting outside with a Valtera clear fitting and gate valve. Not everyone can get a good flush with they way I do it due to how their black tank drain line runs...
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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10-26-2018, 05:59 AM
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#8
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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Thank you Chuck S , Well i was going fishing this morning... ...but now I'll be plumbing .. I m going to just replace it as you and Jkoler70 have advised ... I'll follow up when repair complete. Jeremy888
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10-26-2018, 06:50 AM
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#9
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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To all, They are mostly 60$+ There is one called an " atmospheric vaccuum breaker " at Lowes for $ 11.37 ..Will this work? see photo . ill needva couple of 1/2 " nipples too.
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10-26-2018, 07:19 AM
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#10
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Senior Member
Join Date: Dec 2017
Location: Lisbon
Posts: 551
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Mine was leaking so I just got rid of it and use a backflow preventer device on my hose connection outside of the trailer.
__________________
2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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10-26-2018, 09:12 AM
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#11
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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pregnsnt idea
To: Steve57, Pregnant,(very good!) Idea. And if it leaks its outside the trailer!!! So did you put ir right on the hose bib , or where the hose connects to the trailer? I suppose it would not matter..
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10-26-2018, 11:15 AM
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#12
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Senior Member
Join Date: Dec 2017
Location: Lisbon
Posts: 551
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Quote:
Originally Posted by Jeremy888
To: Steve57, Pregnant,(very good!) Idea. And if it leaks its outside the trailer!!! So did you put ir right on the hose bib , or where the hose connects to the trailer? I suppose it would not matter..
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I just leave it permanently connected to the black tank flush trailer connection.
__________________
2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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10-26-2018, 01:40 PM
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#13
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Member
Join Date: Oct 2017
Location: San Diego
Posts: 87
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I learned a lot ...fixed as per steve's advice .Used a 1/2 inch 90 elbow and 1" long nipple( plastic drip line fittings) to replace the cheap anti siphon piece of junk. Put the 3/4 " vacuum breaker on the out side flush hose . Tested and proved . Total cost $7.42. Plan to also use the flush fitting on the sewer hose as per John's advice. I need both ways to help me remove " poop mountain " cordially left for me from the previous owner . Thank you to all who helped out here
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11-01-2018, 09:32 AM
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#14
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Senior Member
Join Date: May 2018
Location: Winchester
Posts: 113
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Easiest way is to use a shark bite fitting that has a built in check valve and do away with it. It doesn't need a vent, and the valve is normally closed unless the black tank flush is pressurized. $14 or so at Lowes.
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11-01-2018, 09:45 AM
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#15
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Senior Member
Join Date: May 2014
Location: Eastern GTA
Posts: 195
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On mine, the previous owner must have had a leak in that plastic vacuum breaker valve because he installed a plastic 90° fitting in its place. I use a simple brass vacuum breaker valve on the end of my dedicated black tank flush hose outside. I'd put one inside it they didn't cost so much but I can't justify the price as a weekend and vacation camper. If I was a full timer I'd be willing to spend a little extra to have it in the line inside.
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2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2019 Rockwood Signature 8290BS (2019-2023)
2011 Rockwood Signature 8293SS (2014-2018)
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11-01-2018, 12:40 PM
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#16
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Senior Member
Join Date: Oct 2017
Location: Brisbane Australia
Posts: 708
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And for your bonus question: How much pressure can the water system take?
Look at the water pump for a sticker that shows its output pressure. Then set your regulator for something near that pressure, not much more. Your plumbing may withstand high pressures from the city mains, but that pressure may cause the non-return valve in the pump to jam. If that happens, you'll have to disassemble the pump to free it.
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11-01-2018, 06:51 PM
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#17
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Member
Join Date: Jun 2018
Location: Columbus
Posts: 30
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Ok I'm the ignorant one here. I hook up a hose to flush my black tank, the water sprays into the tank to rinse out whatever. Sometimes I close the waste valve to fill the tank to gather waste not being hit with the spray. Eventually the waste water coming out clears up and I disconnect everything. What vacuum or siphon am I creating? I'm not quite getting this?
__________________
2018 Cougar 338RLK
2013 Ford F-350 6.7 Powerstroke
Been with DW for 50 years
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11-01-2018, 07:07 PM
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#18
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,351
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Quote:
Originally Posted by Jacketsbum
Ok I'm the ignorant one here. I hook up a hose to flush my black tank, the water sprays into the tank to rinse out whatever. Sometimes I close the waste valve to fill the tank to gather waste not being hit with the spray. Eventually the waste water coming out clears up and I disconnect everything. What vacuum or siphon am I creating? I'm not quite getting this?
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The anti siphon valve is installed between the hose connection and the black tank. The valve is installed at a higher elevation than the hose connection, so when you turn on the hose, water has to travel UPHILL to the anti siphon valve, then DOWNHILL to the tank. Inside the valve is a “plug” that lifts and allows water to flow in one direction, and when you turn off the hose and disconnect it falls and allows the water in the line between the valve and hose connection to drain WITHOUT pulling any water from the other side.
This is the quick explanation, hope I explained it enough to answer your question.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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11-01-2018, 08:31 PM
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#19
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Senior Member
Join Date: Aug 2018
Location: prophetstown
Posts: 318
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Quote:
Originally Posted by jkohler70
That's the anti-backflow valve for your black tank flush. It's a vacuum breaker. I've only heard of them leaking when using the black tank flush. There's no pressure in that line otherwise. It's a part that is often overlooked during winterizing and cracks. Some have replaced them with a brass valve from the hardware store.
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When I tried to use my black tank flush I went in side and water was coming out under the bathroom sink. Is that valve likely what caused the water on the floor ? And what's the remedy. That is in advance
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11-02-2018, 05:32 AM
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#20
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Member
Join Date: Dec 2015
Location: Minnesota
Posts: 57
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Quote:
Originally Posted by Local150
When I tried to use my black tank flush I went in side and water was coming out under the bathroom sink. Is that valve likely what caused the water on the floor ? And what's the remedy. That is in advance
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Mine leaked there too the first time out and the problem was the interior PEX line wasn't securely clamped to the hose connection receptacle on the outside. The remedy was to remove the receptacle from the outside, pull it and the attached PEX line out through the opening then separate and secure the PEX line to the receptacle with a new and better hose clamp. Problem solved.
Hope this helps!
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Jeff
2017 Premier 26RBPR
2016 F-150 XLT SCrew 4x4 w/3.5 EcoBoost & MaxTow
Previous: 2014 F150 SCrew 4x4 w/3.5 EcoBoost; 2014 Laredo 274RB
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