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Old 10-11-2016, 06:11 PM   #1
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1996 34' Excella
Elberta , Alabama
Join Date: Oct 2006
Posts: 763
Removing black and grey water valves on '96 34'

Guys, I need some advice, I have a broken (cracked) Thetford valve on the black water tank. My repair guy said it would be major to remove the valve, as it's glued into the black water tank.
If it is glued in, why is there a heavy duty clamp where the valve body connects to the tank. It looks to me if the clamp is removed, on both the black and grey water tanks, after the valves are taken apart the entire plumbing should come out, and the valve bodies, connected to the tank should be able to be removed.....
I've done a lot of stuff to Airstreams, but this is a new one for me....advice is welcome....


Old age is coming at a really bad time!

1996 34' Excella 1000, interior totally redone, 2003 Dodge/Cummins HO, U.S. Gear exhaust brake, Diablo tuner, 115 gallon aux fuel, Bedslide, Airsafe/Reese Dual Cam, and a bunch of other stuff
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Old 10-11-2016, 06:39 PM   #2
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1995 25' Excella
xxxxx , xxxxxx
Join Date: Apr 2015
Posts: 1,399
My 1995 was not glued in. The large clamp holds the valve to tank adapter inside the tank neck.

The plumbing after my valves has a rubber connector holding the the black and gray Ys together to create the dump manifold.....taking that connector loose made removing and replacing the valves easy.

I replaced both of my valves last summer. The job was fairly straight forward. I bought new valves and tank adapters. I bought the plumbing pipe at the big box hardware store.

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Old 10-11-2016, 07:40 PM   #3
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1986 34' Limited
1975 27' Overlander
Conifer , Colorado
Join Date: Jun 2009
Posts: 3,850
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My trailer is ten years older than yours, and quite possibly built differently. My dump valve manifold was not glued to the tanks. However, there was what I call white "butyl caulk" between the molded tank drain and the ABS piping. Mine has a hose clamp around it.

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Old 10-11-2016, 09:50 PM   #4
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1974 Argosy 26
Morrill , Nebraska
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My '74 Argosy has the same setup as your '96. I doubt it is glued. Just a hose clamp. Unless your tank is ABS I doubt there is any glue that would bond the sewer pipe and the tank fitting.
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Old 10-11-2016, 10:59 PM   #5
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1991 25' Excella
Hartford , Wisconsin
Join Date: Feb 2016
Posts: 66
I did the valves and piping this past summer here the link to my posts on yhe subject
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