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Old 10-18-2022, 01:27 PM   #1
1987 Excella 32'
 
1987 32' Excella
Kennewick , Washington
Join Date: Sep 2009
Posts: 19
1987 excella 1000 black dump valve replacememnt

Working on replacing my original Thetford (?) black dump valve. Which valve do I need and how do I go about replacing it? Looks like it's not a simple "unbolt old, slip in new"
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Old 10-18-2022, 01:37 PM   #2
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1994 25' Excella
Waukesha , Wisconsin
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I went through the same repair this summer, and it looks like you have the same/similar setup.

Here's the thread I posted with all the details.

https://www.airforums.com/forums/f44...ft-236597.html
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1974 GMC 4108a - Custom Coach Land Cruiser (Sold)
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Old 10-18-2022, 02:19 PM   #3
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1998 31' Excella 1000
1979 23' Safari
Mooresville , Indiana
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You can also buy a rebuild kit for the valve and reuse it, unless you really want to change it out.


Damon
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Old 10-18-2022, 02:21 PM   #4
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1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
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The above thread posted by Richard is good. You can get the valves from Outdoors Mart or Amazon. About $70 each. You get the correct ones for sure from Outdoors Mart. Where I differed from the norm is I used PVC pipe instead of ABS because I could get it locally and the delivery times on the ABS were very long at that time. As far as I can tell it works just fine. I did put a Valterra connection on for the dump hose but used the Tetford valves. Once the hole is cut for access it is not really too bad a job to replace the plumbing.
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Old 10-18-2022, 03:15 PM   #5
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1994 25' Excella
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Quote:
Originally Posted by damonbeals View Post
You can also buy a rebuild kit for the valve and reuse it, unless you really want to change it out.
Damon
#4827
Rebuild kits are okay, but if the valves are original I'd suggest swapping out the valves AND the adapters (you need to buy the adapters separately.) The plastic in these gets brittle with age and it makes no sense to go through all the work only to have something crack a month from now. There's another thread about a similar repair, and he found his adapters crumbling when he pulled them out.

Quote:
Originally Posted by Bill M. View Post
The above thread posted by Richard is good. You can get the valves from Outdoors Mart or Amazon. About $70 each. You get the correct ones for sure from Outdoors Mart. Where I differed from the norm is I used PVC pipe instead of ABS because I could get it locally and the delivery times on the ABS were very long at that time. As far as I can tell it works just fine. I did put a Valterra connection on for the dump hose but used the Tetford valves. Once the hole is cut for access it is not really too bad a job to replace the plumbing.
There are a few versions/varieties for these valves. The biggest variation is whether or not the adapters glue on or are a press fit. Verify which you have and order the same. The other variation on these valves is whether or not they are designed to work with extension handles or not. You'll need the ones for use with extensions.

Out Of Doors Mart has these all on their website last I looked. They ship fast and their prices were better than I found elsewhere.

About the rebuilt kit...order one to keep in your spares box. If one of the new valves fails you can use it to fix the leaking seal.
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1994 Excella 25 Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8
1974 GMC 4108a - Custom Coach Land Cruiser (Sold)
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Old 10-19-2022, 11:23 AM   #6
1987 Excella 32'
 
1987 32' Excella
Kennewick , Washington
Join Date: Sep 2009
Posts: 19
Quote:
Originally Posted by richard5933 View Post
I went through the same repair this summer, and it looks like you have the same/similar setup.

Here's the thread I posted with all the details.

https://www.airforums.com/forums/f44...ft-236597.html



Thank you - great detail.
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