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Old 10-06-2013, 12:11 AM   #1
1 Rivet Member
1989 25' Excella
okeechobee , Florida
Join Date: Apr 2013
Posts: 5
sewer adapter for 1988 25 ft Excella Airstream

Hi everyone
I just purchased a 27gallon XL Thetford portable waste tank. I realized that my sewer pipe on my 1988 25 foot Excella airstream is 4 inches. Is there an adapter to reduce from 4 to 3 inches so I can go directly from the airstream to the portable tank?

John Wade
Okeechobee Fl
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Old 10-06-2013, 08:21 AM   #2
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1966 17' Caravel
Newport , North Carolina
Join Date: Jan 2013
Posts: 1,287
Walmart and when I looked at them I could not figure out why I wanted one!
Gotta get busy! Have a great day! Now where did I put those revits?
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Old 10-06-2013, 08:40 AM   #3
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1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
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Why the portable tank? The standard dumping arrangement for a 80 trailer would be a Thetford adaptor on the trailer that goes to a 3" hose. Check vintage trailer and OutDoors mart online for the fittings. They carry a variety of the Tetford adaptors. I was able to get on to connect to a solid sewer pipe, for instance. What is the portable tank for? Extended boon docking. Walmart seems to have pretty much quit carrying the Tetford fittings for the older Airstreams.
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Old 10-06-2013, 10:04 AM   #4
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1974 Argosy 26
Morrill , Nebraska
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I believe the sewer pipe is 3" on your coach. 4" is huge, I use a 4" pipe to store the sewer hose.
You can go to the Thetford web site and find what is available.
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Old 10-06-2013, 05:58 PM   #5
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Gainesville , Florida
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You can buy a hose with bayonet fittings on each end so you can hook up the tank to the trailer. Thetford through camping world on line. Jim
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Old 10-07-2013, 02:22 PM   #6
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1989 32' Land Yacht
Oakton , Virginia
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Hi John,

What hose are you using now to dump from your 1988 25 foot Excella to a campground sewer line?

I use an adapter from Amazon to go from my 89 Squarestream to a common slinky. Then another adapter from the slinky to the campground sewer line.

This is the adapter:
Valterra T05-2285VP; Thetford to Valterra Universal Adapter

Valterra T05-2285VP Thetford to Valterra Universal Adapter : Amazon.com : Automotive
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Old 08-04-2015, 01:41 PM   #7
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1988 34' Excella
Groton , Vermont
Join Date: Jun 2015
Posts: 1
Hey everybody,
Just came into owning a 1988 34' excella. I need a sewer drain hose. Would like to have one about 15 feet. Any suggestions?
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