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05-10-2016, 03:32 AM
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#1
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Established Member
Join Date: Jun 2015
Location: Valparaiso
Posts: 18
M.O.C. #17508
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Adding a washer/dryer combo and plumbing
I'm putting in a washer/dryer combo and called Keystone to find out if they had a P-trap in the wall or somewhere for the washer drain. There is a label on the wall that says "the washer is not hooked up to a holding tank, and to make sure your hooked up to the camps sewer line". Keystone advised that there is not a P-trap installed. To me that means that nothing is preventing sewer gases from entering the RV. Has anyone had this problem or installed a P-trap on their own?
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05-10-2016, 03:50 AM
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#2
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,171
M.O.C. #6433
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What year and floorplan do you have?
Not hooked to a tank means the washer drain line runs directly to the sewer drain pipe and you must be connected to the park sewer connection for the washer to drain. Otherwise it would back up and overflow out the drain pipe behind the washer. If the drain pipe is installed I would think it does have a P trap there though.
Some Montana washer drains are piped to the grey water tank and some, like yours, are piped directly to the drain outlet. Mine goes to the grey tank. You guess is as good as mine as to why.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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05-10-2016, 03:58 AM
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#3
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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Our simple solution has been to configure the sewer slinky hose in the form of a p-trap at the end of the slinky. Our 3400 was plumbed directly bypassing any tank.
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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05-10-2016, 04:44 AM
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#4
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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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And I would not believe that sticker. Do your own homework to see where it really drains first. 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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05-10-2016, 09:17 AM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,371
M.O.C. #4831
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X2 on the sticker. It seems to be installed in every Montana, yet most find their grey tank is involved. Be sure to test it out.
Regardless of the connection method (direct or through a tank), practical use of a washer requires a open path to the sewer line. As Bingo wrote, provide your own P trap using the sewer hose to prevent sewer gasses from coming back at you.
__________________
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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05-10-2016, 12:12 PM
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#6
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Montana Master
Join Date: Feb 2004
Location: Pahrump
Posts: 2,523
M.O.C. #1081
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Ignore that sticker....Ours has the same sticker and we found out the washer is plumbed into the bathroom grey water tank.
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05-10-2016, 12:35 PM
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#7
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,171
M.O.C. #6433
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Our washer is plumbed into the grey tank. And our grey tank valve typically stays open until I want to collect some water before draining the black tank. And I don't form a trap in the sewer hose. If fact I use one of those flexible thingies to support the sewer hose and keep a slope all the way to the drain so water does not collect in it. Now having said all that, we have never had sewer odors come up thru the washer drain inside the trailer. For that reason I think there must be a built in P trap or some other means to isolate that line.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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05-12-2016, 02:53 AM
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#8
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Established Member
Join Date: Jun 2015
Location: Valparaiso
Posts: 18
M.O.C. #17508
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Thanks for the information. I took a small camera I use for fishing and snaked it down the pipe, and Keystone was correct it is piped to the main sewer drain. I am getting a rubber reducer to seal the pipe to the washer drain hose. There just isn't enough room to put a P-trap in without tearing some of the wall out. With this pipe going straight to the main line there shouldn't be any problems of back pressure as long as the sewer line valve is open. Thanks again..
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05-12-2016, 04:43 AM
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#9
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,171
M.O.C. #6433
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Det107 - I am curious to know if you have an open pipe with no trap from the washer closet all the way to the drain. As I mentioned, mine is piped to the grey tank. But I normally leave the grey tank valve open unless I need to collect water to flush the sewer hose after draining the black tank. But my washer drain hose just drops into the washer drain pipe with no seal. But I have never had any sewer odor come from that pipe in 8 years. Wondering if I have just been lucky, or if there is something blocking sewer odors from coming back up in my piping. I don't plan on changing anything, just wondering.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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05-12-2016, 06:53 AM
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#10
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,702
M.O.C. #12947
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I would not recommend sealing the washer drain hose to the drain line. If you do, the water will siphon all the water from the machine and most washers depend on some water to remain in the system so the pump remains immersed and does not need to be primed each time.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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