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Old 11-05-2013, 07:34 PM   #1
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Portland , Oregon
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Leaky Thetford Outlet Connection--How to fix?

I have a 1998 31' Excella in generally very good condition (I purchased it about 6 months ago).

I've noticed that the drain hose that came with it will need to be replaced sooner than later--it has some pin prick holes (I can hear air rushing in and out of it).

I've also observed very minor leaking out the outlet connection. The whole thing connects to a Y or something, b/c I drain both black and grey at the some outlet.

The outlet connection and hose bayonet appear to be original Thetford parts. I purchased a new Rhino hose but the bayonet did not fit the outlet connection on the trailer (the connection was too big and the bayonet simply didn't fit onto it--i.e., the bayonet is too small to go over the outlet connection).

The outside of the outlet is 3 and 3/4" (not counting the pegs for bayonet). The inside is 3".

Can I use a coupler directly on the inside and then a new outlet with pegs so I can adapt for a new Rhino or other hose?

I tried the Thetford hose system (Smart Drain or something like that), but it was too small for the outlet too.

If I try the coupler should I just glue it with proper adhesives (looks like the outlet pipe is ABS, but I'll check with Airstream before I do anything)...

Thank you.

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Old 11-05-2013, 08:09 PM   #2
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1974 Argosy 26
Morrill , Nebraska
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You can get an adaptor to fit the existing outlet that will connect with the new hose.
Look at Thetford to Valtera adaptors

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Old 11-08-2013, 04:18 PM   #3
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Portland , Oregon
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TG Twinkie--thanks for the tip! I did a quick look and found some options. Do you think I should glue the adaptor in or just attach it to the bayonet and then insert into the existing outlet with a little silicon treatment to maintain the seal? Thanks!
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Old 11-08-2013, 04:43 PM   #4
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2001 30' Excella
Somerset , New Jersey
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Just food for thought here. You might want to look for a clear elbow to use in your discharge. Makes for good entertainment to watch the " stuff " as it exits. Also lets you see when the discharge begins to run towards clear so you know you've gotten a good dump. I use a flush king in addition a few times per season. It has a hose fitting and allows you to quickly backfill the tanks to allow high volumes of water to empty and carry the you-know-what's with it. Neither of these are necessities but I do find them useful. I have the same fitting issue you have. I use an adapter and one of these days need to put a proper fitting on it. Any day now.
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Old 12-04-2013, 03:49 PM   #5
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Portland , Oregon
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Just wanted to follow up on this--should I do something on an ad hoc basis, or use the appropriate glue or resin to make a more permanent adaptation?


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Old 12-04-2013, 03:53 PM   #6
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I just carry the adapter with me and install it as necessary. Works with my Sewer Solution and my Rhino hose. The little horns on the adapter are relative easy to break so go easy.


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