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Old 04-16-2016, 10:36 PM   #1
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Connecting 2 grey tanks

My TT has 2 grey water tanks. One on the galley with it's own drain valve handle and outlet.
Another one at the rear for bathroom shower/sink. It is hooked to and shares the black water drain with grey water valve and handle and black water valve and handle. When I have hooked up to a full hook up site, I can use a three way connector at the sewer drain or hook up a water hose to a single connector at the sewer drain. If I go to dump station, I have to do 3 dumps - one for front grey and two for the rear grey/black. I would like to hook up the front 1 1/2 inch pipe to the rear with a permanent hook up and be able to do the normal 2 dumps using the rear outlet. Pull valve on black first with first drain, close and then the grey valve for the second dump. Has anyone plumbed the front grey to the rear grey?
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Old 04-16-2016, 11:15 PM   #2
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I use one of these RV Hydro Flush 45 Degree - Valterra F02-4100 - Sewer Flushing - Camping World
and one of these Termination Cap with Hose Connector - Valterra T1020-1 - Sewer Fittings & Adapters - Camping World

and a dedicated piece of garden hose to connect the front outlet to the rear outlet when on full hookup sites.

I have done this for 10 years and never had an issue with the setup.

John U
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Old 04-17-2016, 04:26 PM   #3
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midnightpumpkin,
I like that idea. I was going to use a water hose to connect from front (galley) to a water hose connection at the sewer drain instead of the rear drain at the trailer. But I like your idea better. Because with my idea, the water hose length will vary depending on the distance from trailer to sewer drain. With your idea, it would be the same length of water hose from front trailer drain to back trailer drain.
Thanks..........
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Old 04-17-2016, 05:19 PM   #4
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Midnightpumpkin,
I looked at my 2 drains. You said you run a water hose from the front to the rear using Valterra F02-4100 on the rear. I must be missing something. If I use a water hose to connect the two drains. I think the water hose would sag downward from the front and will not drain to the rear. Or does it just fill up and finally drain? Or do you just use enough water hose to barely reach the rear with just a little sag? I have some old hoses that I could measure, cut and put on a new end.
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Old 04-17-2016, 05:26 PM   #5
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I hard plumbed the galley tank with the grey tank with 1.5" pvc. Cut into the elbow on the rear(galley) tank and ran the 1.5" pvc forward, installed a slide valve and then into the grey & black tank discharge elbow. Leave the rear (galley) valve open and a cap on the discharge. Just open and close the 1.5" slide valve when I want to empty the galley tank. It may not completely empty the tank, but so far it has worked just fine for 4 yrs.
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Old 04-18-2016, 01:25 PM   #6
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Quote:
Originally Posted by OldCoot View Post
I hard plumbed the galley tank with the grey tank with 1.5" pvc. Cut into the elbow on the rear(galley) tank and ran the 1.5" pvc forward, installed a slide valve and then into the grey & black tank discharge elbow. Leave the rear (galley) valve open and a cap on the discharge. Just open and close the 1.5" slide valve when I want to empty the galley tank. It may not completely empty the tank, but so far it has worked just fine for 4 yrs.
I did the same thing in my last Puma. Worked like a charm! I suggest hard plumbing it.
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Old 04-19-2016, 10:11 AM   #7
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I just run a sewer Y. Though, I might look in to doing that hard plumbing since it'd be easier in the long run.

http://www.amazon.com/Camco-39812-Rh...rds=RV+sewer+Y
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Old 04-24-2016, 05:36 PM   #8
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Originally Posted by txredfish View Post
Midnightpumpkin,
I looked at my 2 drains. You said you run a water hose from the front to the rear using Valterra F02-4100 on the rear. I must be missing something. If I use a water hose to connect the two drains. I think the water hose would sag downward from the front and will not drain to the rear. Or does it just fill up and finally drain? Or do you just use enough water hose to barely reach the rear with just a little sag? I have some old hoses that I could measure, cut and put on a new end.
With my setup, the hose connection point at the front tank is higher than the connection point on the F02-4100 at the rear. This allows the hose to be disconnected from the front tank without any gray water spilling on the ground.
I just lift the disconnected hose up high enough to drain it into the rear port. If possible i will flush the hose with fresh water before I disconnect it.

John U
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