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07-03-2017, 03:12 AM
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#1
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Junior Member
Join Date: Jul 2017
Location: Galloway
Posts: 14
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Two Grey Tanks 3 Valves
I have two Grey Tanks but have three Grey tank valves. Its obvious what the first two are. Galley tank and bathroom tank.. but the 3rd smaller valve, what is its purpose? nothing ever comes out of it.
all help appreciated.
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07-03-2017, 03:31 AM
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#2
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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Could one of those be your fresh water drain? You didn't say if you were on city water or your fresh water tank for water source.
Sent from my SAMSUNG-SM-N910A using Tapatalk
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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07-03-2017, 04:38 AM
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#3
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Junior Member
Join Date: Jul 2017
Location: Galloway
Posts: 14
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ctbruce, thanks for your reply.. i wish i knew how to post a picture. this small Grey valve ties directly into the Main dumping connection. its about 1 1/2"pipe that comes from the direction of the bathroom. I know I have two grey tanks and when i dump them my gauges zero out. this one looks like it could be some sort of vent.. BTW, i have located the fresh water drain which is near the back... Im still a newbie trying to figure this stuff out.. seems like they would have better manuals. thanks again.
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07-03-2017, 04:41 AM
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#4
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Junior Member
Join Date: Jul 2017
Location: Galloway
Posts: 14
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3rd Grey Valve
Hope this picture comes through
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07-03-2017, 04:42 AM
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#5
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,313
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Do you have washer/dryer hookups in your trailer?
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Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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07-03-2017, 04:44 AM
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#6
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Junior Member
Join Date: Jul 2017
Location: Galloway
Posts: 14
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the valve I am referring to is the one on the left.
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07-03-2017, 04:45 AM
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#7
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Junior Member
Join Date: Jul 2017
Location: Galloway
Posts: 14
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yes, this could be what thats for... i will look closer
thanks
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07-03-2017, 05:13 AM
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#8
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Senior Member
Join Date: Jun 2017
Location: Downey, Ca.
Posts: 344
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Quote:
Originally Posted by chuckster57
Do you have washer/dryer hookups in your trailer?
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I do not have a unit with a washer but I find this interesting just the same. I'd have to assume the theory for this smaller grey valve is to allow the washer to dump directly out when one is permanently stationed at a sight with waste access and only at that time doe's one run their washer. Am I in the ball park ?
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07-03-2017, 05:29 AM
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#9
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Senior Member
Join Date: Oct 2016
Location: Sherman
Posts: 326
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That sounds feasible. Is Your unit set up for W/d?
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2017 Alpine 3401RS,Titan Disc brakes,Morryde SRE 4000, 2016 Ram 3500HD Laramie SRW,LWB,4X4, Aisin transmission
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07-03-2017, 05:32 AM
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#10
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Senior Member
Join Date: Jun 2017
Location: Downey, Ca.
Posts: 344
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Quote:
Originally Posted by Ddubya
That sounds feasible. Is Your unit set up for W/d?
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To whom is the question directed to 
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07-07-2017, 07:47 AM
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#11
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Junior Member
Join Date: Jul 2014
Location: Waldorf MD
Posts: 17
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Quote:
Originally Posted by raddad73
the valve I am referring to is the one on the left.
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I would think the valve on the left is the galley tank. The farthest one back is the black tank and the middle one is bathroom grey tank.
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2013 F-250 Platinum 6.7L
2015 Keystone Outback 312BH
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07-07-2017, 09:49 AM
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#12
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Senior Member
Join Date: Jan 2011
Location: Austin, Tx
Posts: 1,910
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If it helps, the grey tanks are going to drain through 1 1/2" pipes, the black tank will have a 3" drain pipe. Three tanks, three valves, I'm not seeing an issue here. Am I missing something?
Also, one of the valves may have been mislabeled.
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2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
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07-07-2017, 10:37 AM
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#13
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Site Team | Emeritus
Join Date: Jan 2014
Location: Western PA
Posts: 2,732
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Not a science project, just need some water and there will be no guessing as to what is what. Pour water in and pull valves to see when water comes out. Like to keep it simple 
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