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05-22-2015, 06:23 AM
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#1
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Seasoned Camper
Join Date: Mar 2013
Location: Neville
Posts: 85
M.O.C. #13316
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Plumbing question
We have a 3402rl but I am sure plumbing is simular in others. Under our bedroom sink I have 4 lines coming up. 2 red 2 blue. 1 red and 1 blue are tied into a small black "box". The other 2 are for the taps. My question is what is the black box for? Occasionally I get a drip of water coming out of it. Thanks
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05-22-2015, 07:23 AM
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#2
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Montana Fan
Join Date: Jun 2011
Location: stockton
Posts: 405
M.O.C. #11457
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That's your back flow preventer for your sewer flush line. It's a frequent source of trouble, but be glad it's in a location you can get to easily.
__________________
 2014 Montana Mountaineer 331 RLT. Winneguard SWM Traveler Satellite Antenna, Progressive 50 amp portable EMS, 6 point Level Up.. 2016 Chevy 3500 Duramax Dually, long bed, B&W Patriot hitch.
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05-22-2015, 08:21 AM
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#3
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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 removed that valve either before or after it failed and use an external backflow preventer.
__________________
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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05-22-2015, 08:30 AM
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#4
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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Looks something like this?
Should only leak when you use the black tank flush. But when they do leak, they can quickly flood the floor. If it is starting to drip I would replace it or eliminate it before using the black tank flush again. As stated above, many of us have removed it, plumbed the two lines together, and added an external backflow preventer valve.
And be glad it is under the sink. Mine was inside a wall.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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05-22-2015, 10:20 AM
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#5
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Seasoned Camper
Join Date: Mar 2013
Location: Neville
Posts: 85
M.O.C. #13316
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It looks exactly like that and you are right, we noticed the leak just after I dumped and flushed tank. At the campsite we are in the water pressure seems quite high. Do you think higher pressure could increase chance of water coming through box?
Thanks tp everyone that replied.
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05-22-2015, 10:43 AM
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#6
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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To your question of higher pressure, yes.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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05-22-2015, 11:45 AM
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#7
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Montana Master
Join Date: Aug 2008
Location: New Bern
Posts: 4,372
M.O.C. #8728
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I was told by my local RV place that Keystone is the only company that uses them. I eliminated it and use an external one.
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05-22-2015, 11:48 AM
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#8
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Montana Fan
Join Date: Jul 2011
Location: Elgin
Posts: 262
M.O.C. #11570
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Where do you mount the external backflow preventer valve.
And what is it's use ?
o you really need to have one installed ?
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05-22-2015, 01:45 PM
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#9
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Most of us use something like this: http://www.amazon.com/Homewerks-VAC-...flow+preventer
The purpose is to keep water from the black tank from flowing or being siphoned back into your water hoses and drinking water system. There are a number of ways this could happen, mostly as a result of a mistake or a severe drop in water pressure. Is it likely to happen, probably not, has it happened, yes both with RV's and restaurants.
__________________
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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05-22-2015, 03:25 PM
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#10
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,550
M.O.C. #2283
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Mine leaked last week. I took it out and replaced it with a one way inline valve for $22. The original one was $77. The guy that owns our camper store said they are required by federal law in all campers with a black tank spray cleaner.
Lynwood
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05-23-2015, 01:39 AM
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#11
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
quote:Originally posted by martyperu
It At the campsite we are in the water pressure seems quite high.
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I hope you have a water pressure regulator mounted !
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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