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Old 10-08-2014, 01:52 PM   #1
Wesedge
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M.O.C. #15732
Rear grey/black water valve not labeled

I've purchased a 2015 montana 350qbq. We are living in it full time while we build our house. I noticed the rear valves for the grey/black water are not labeled. Anyone know which is which? It my first time dumping the rear tank and only need to drain the grey water
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Old 10-08-2014, 02:45 PM   #2
rohrmann
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From your floor plan, you probably have a grey and a black control valve in the convenience center. Those are for the black (toilet), and grey, (shower and bath sink). The rear valve should be for the galley (kitchen grey tank). So, to drain the bath grey, pull the valve labelled grey in the convenience center.
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Old 10-08-2014, 02:56 PM   #3
1retired06
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Stated problem was no labels. To eliminate any guessing (if the dealer cannot answer your question) take a hose, fill your black tank thru the toilet. Pull a valve and if the toilet does not dump, that valve is your gray. FYI, our 3915 has two grays, two blacks, the left hand pulls are the black tanks.
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Old 10-08-2014, 03:04 PM   #4
Wesedge
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I decided to wait until daylight tomorrow and just hook up the flojet with the clear extension. That should answer which is which without a doubt! The front tanks were labeled, rear were not.
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Old 10-08-2014, 11:48 PM   #5
Phil P
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M.O.C. #11206
More Keystone quality control or lack of.

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Old 10-09-2014, 02:03 AM   #6
DonandBonnie
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Over time we ran water from each source within the coach, then dumped to be sure which tank it drained into.
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Old 10-09-2014, 10:36 AM   #7
Wesedge
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M.O.C. #15732
Well, the valve closest to the rear of camper is the black water tank. If I had guessed, I would have been wrong. Thanks for the responses
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