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Old 06-30-2020, 07:06 PM   #1
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1984 31' Excella
Montara , CA
Join Date: Apr 2019
Posts: 10
Waste outlet size on '84 Excella 31'

Our waste outlet on our '84 Excella 31 is 3-3/4" OD. We have a twist coupling fitting elbow that fits this waste outlet. The old sewer hose developed a leak so we bought a new Thetford Titan hose complete with fittings. The Thetford twist coupling is 3-1/2" ID so it's too small & won't fit on the outlet. We've searched far & wide and can't find a hose kit that will fit. So we cannibalized the hose kit and cut off the outlets but can't fit the hose on the twist coupling either. We can't find a hose that works either. Does anyone know who sells this bigger diameter sewer hose coupling & hose? Guess I can cut off the trailer coupling and glue on a new 3-1/2" ABS fitting but figured I would check here before modifying.
Attached Files
File Type: pdf Existing outlet.pdf (1.45 MB, 10 views)
File Type: pdf New hose coupling.pdf (1.44 MB, 12 views)
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Old 06-30-2020, 08:22 PM   #2
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1995 25' Excella
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Sounds like you have a Thetford brand hose that fits a Valterra bayonet.
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Old 06-30-2020, 11:50 PM   #3
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1984 31' Excella
Montara , CA
Join Date: Apr 2019
Posts: 10
Well nothing "fits" so would you mind being a little more clear with a solution here?
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Old 07-01-2020, 03:21 AM   #4
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1989 29' Excella
1979 31' Sovereign
1999 25' Safari
Youngsville , North Carolina
Join Date: Sep 2006
Posts: 278
Sewer Hose

The connection you have is a Thetford. They do make an adapter to allow you to use Valtera (Black) hose on a thetford fitting. Most campers today use Valtera fittings, much less $$$ than the Thetford, and available everywhere.

I would suggest cutting off White Thetford fitting and install a Valtera fitting.

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Old 07-01-2020, 07:31 AM   #5
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1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
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Yes, it is confusing. Older Airstreams have what is called Tetford fittings. Newer Airstreams and almost every other brand trailer have what is called Valterra fittings. Now for the confusing part: Tetford now makes hoses with Valterra fittings on them. That is what everybody uses and sells. You can order (but probably will not find in a store) a coupler that lets you convert the Tetford on your trailer to a Valterra. Stick it on with silicone caulk. Or, you can cut the end of the pipe off and glue on a Valterra adaptor as has been suggested. Outdoors mart Airstream sells the adaptor online. Amazon probably does too.
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Old 07-01-2020, 08:11 AM   #6
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2017 26' Flying Cloud
Tampa , Florida
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While you're thinking about it, why not use the adaptor?
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Old 07-01-2020, 09:31 AM   #7
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1964 30' Sovereign
Ione , CA
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Same problem with new tanks we had installed in our 1964 Sovereign 30'. We also found the adaptor. Works fine.
Mark & Melanie Trowbridge
1964 Airstream Sovereign 30' (Double)
2004 Dodge Ram QuadCab 4x4 Diesel
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Old 07-01-2020, 03:10 PM   #8
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1991 25' Excella
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belmont , North Carolina
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I agree with Bill and imho the adapter isn’t worth it. Do it right - hacksaw the coupler off the old 3” waste line and glue a new on a Valtera. Less than a $5 fix.
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Old 07-01-2020, 08:10 PM   #9
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1995 25' Excella
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I have one of those adapters. Never used it. I don't believe it is either very secure nor leak proof.
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Old 07-02-2020, 07:00 AM   #10
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Morrill , Nebraska
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The ears on the adaptor tend to break off.
Remove the old Thetford fitting and install a new Valterra fitting.
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Old 07-08-2020, 10:40 AM   #11
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1976 24' Argosy 24
1999 30' Excella 1000
White Haven , Pennsylvania
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I use the adapter. I put it on and leaver it on. Have had no problems and can use the much cheaper valtera stuff.
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