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Old 08-05-2016, 06:55 AM   #1
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1979 31' Excella 500
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Sewer swivel fitting too big?

I recently purchased the Camco 39761 RhinoFLEX 15' RV Sewer Hose Kit with Swivel Fittings and found that the Bayonet-style Swivel Fitting is too small to fit on my 1979 Airstream Excella 500 sewer outlet. It is just barely too small, maybe 1/2'' to 1'' in diameter larger and it would fit.

As far as I can tell, this outlet size is supposed to be universal and standard, yet the outlet on my Excella seems too big to fit the standard attachment size. This is the second attachment I've tried that's too small to fit the outlet.
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Old 08-05-2016, 07:12 AM   #2
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This is what you need ,

https://www.amazon.com/Valterra-T05-...+sewer+adapter
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Old 08-05-2016, 10:44 AM   #3
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When you buy the adaptor buy at least 2. They break easily.
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Old 08-05-2016, 10:59 AM   #4
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I second that!


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Old 08-05-2016, 11:35 AM   #5
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I also heard that they are stopping making those adapters - not sure if that is true but I recently bought a couple of spares on Amazon just in case

I wonder if it would be an easy job just to cut off the Thetford connector on the trailer and glue on a Valterra? Anyone know if the pipe sizes are the same? Might be a good thing to do as Thetford stuff seems a lot harder to find whereas even Walmart carries Valterra.

Wonder why AS continues to use Thetford? Maybe they don't on new trailers - Valterra seems to be pretty much the industry standard it seems so sticking with Thetford isn't very helpful to owners unless there is some real advantage that I am not aware of.

I recently bought a third slide valve to go on the outlet of the drain ahead of the cap. Of course I also had to buy a Thetford - Valterra adapter to use it, adding to the cost and leak potential and making it stick out more than I would have liked!

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Old 08-06-2016, 06:58 PM   #6
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Quote:
Originally Posted by TG Twinkie View Post
When you buy the adaptor buy at least 2. They break easily.
They do break easily and at the most inopportune time. I buy them online 4 at a time and always call the seller to combine shipping. They usually ship all for the price of one.
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Old 08-06-2016, 08:49 PM   #7
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I put mine on with a little silicon caulk to keep it from coming loose when I take the hose off. Have not had one break yet, Guess I better order another one.
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Old 08-07-2016, 07:53 AM   #8
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Does anyone know if I can just cut off the Thetford and glue on a Valterra fitting...if so, where can I get one ?
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Old 08-11-2016, 05:35 PM   #9
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I ordered the adapter from Out Of Doors Mart and it works great. Thanks for the advice everyone!
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Old 08-12-2016, 06:19 AM   #10
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I ordered the adapter from Out Of Doors Mart and it works great. Thanks for the advice everyone!
Happy you found them. Hope you ordered several. The are flimsy and break easily.
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Old 08-12-2016, 06:50 AM   #11
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Does anyone know if I can just cut off the Thetford and glue on a Valterra fitting...if so, where can I get one ?
I asked that before and didn't get a reply so I hope you will ! Sounds to me a better idea than messing with adapters. Wonder if people have done that, I would think the pipe sizes are the same but don't know for sure.

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Old 08-12-2016, 07:10 AM   #12
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You would have to measure the diameter of the pipe to be sure. I think it will fit the standard 3" ABS or PVC pipe.
RV manufacturers don't use anything special. Whatever is the cheapest.
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Old 08-13-2016, 12:53 AM   #13
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glue on new fitting?

If you could find or make a pvc sleeve that both the (cut off) original pipe and the new fitting would slide into you would have a much stronger glue joint. You could possibly even turn the insides on a lathe to fit each piece. I wonder if that has ever been done.
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