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Old 11-08-2009, 07:46 PM   #1
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Attention New to Airstream owners - sewer line outlet info - Thetford sewer systems

I thought I'd bring this to the attention of the people who are just buying their first Airstream trailers. Not all of the trailers will have the universal size outlets for the sewer drain line connection. If the dump hoses you're buying at the store [camper dealers or where ever] don't fit, don't be alarmed. In fact, you should check the outlet cap [the name will be formed in to the cap] before you go to get your new hose. If you have a Thetford system - as I do - you will need to get an adapter. Don't get discouraged, it's an easy, and cheap [$10 or less] fitting to get. Go to a camper dealer and tell them you need the adapter for a Thetford sewer system. It's best if you take your cap to match up to the adapter [to the inside dimension]. After numerous trips, and a bunch of dumb looks from the younger counter help, and older man at Chesaco RV realized that what I had, and sold me the adapter I needed [$6.99].
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Old 11-08-2009, 08:19 PM   #2
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Catman...good point. This holds true for those of us that have purchased older units. We have a Bounder and assumed our hose would fit our "78" Ambassador...wrong. Fortunately I found this out before heading our for our first trip in the Airstream.

Bob
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Old 03-12-2010, 01:53 PM   #3
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Me too! I also have a Thetford system and the used AS came with several hoses that didn't fit and the one that did broke. I did get the adapter from Airstream web site but I would like to change out the fitting on the trailer so that it can be used by the 'standard' size fittings. Does any one know where I can get a 'male' standard size fitting for the holding tanks?
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Old 03-12-2010, 02:27 PM   #4
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I believe that you have to replace the valve.
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Old 03-12-2010, 02:33 PM   #5
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It is not the valve that I want to replace it is just the connection fitting that is attached to the waste dump tube coming from the valves.
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Old 03-12-2010, 02:41 PM   #6
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Your RV supply should have the fitting. You have to cut off the old one and glue the new one in it's place. Make sure you have enough pipe left to glue on the new fitting. I did mine and it was less than $10.

Cheers, Dan
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Old 03-12-2010, 02:52 PM   #7
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Thanks Smartstream, I have done a lot of PVC type work, but I have web-surfed many sites and have not found any that list such a fitting. It is a 3.5" OD with a 3" ID size pipe coming from the 'Y' that connects the 2 holding tanks. Just want to change it because there seems to be many more suppliers of the 'standard' size hoses that the Thetford system.
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Old 03-12-2010, 02:53 PM   #8
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Much simpler to just keep the Thetford end + the adapter. Cutting and pasting the other style on strikes me as a job that may be beyond the novice trailerite.

Plus glue doesn't always improve with age; why tempt fate?
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Old 03-12-2010, 03:01 PM   #9
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Quote:
Originally Posted by david686 View Post
Thanks Smartstream, I have done a lot of PVC type work, but I have web-surfed many sites and have not found any that list such a fitting. It is a 3.5" OD with a 3" ID size pipe coming from the 'Y' that connects the 2 holding tanks. Just want to change it because there seems to be many more suppliers of the 'standard' size hoses that the Thetford system.
It probably isn't a fast moving item so you might not see it listed but my local RV place had it on the self and we are kind of out in the boonies here so I don't think it is too hard to find. You wll probably have to talk to the old timer not the kid behind the counter.

Cheers, Dan
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Old 03-12-2010, 03:29 PM   #10
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Thanks guys, just don't want to be left on the road with a "full tank".
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Old 03-12-2010, 09:58 PM   #11
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Good thought, david686. And EYE wouldn't want to be left wid a connection that had fallen off, leaving only a fond memory of some glue, and an (shall we say) "interesting" problem!


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Old 03-13-2010, 04:37 AM   #12
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The Thetford end on my '97 was just glued on from the factory. It was a 10 minute project to cut it off with a hacksaw, and glue on the "standard" fitting. If the proper primer, and ABS adhesive is used, there is no more chance of it falling off than the original from the factory. The adhesive in essence welds the plastics together.
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Old 03-13-2010, 06:18 AM   #13
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craig...where did you find the permanent fitting? It's hard enough to find the adaptor. Thx!

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Old 03-13-2010, 09:52 AM   #14
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I picked mine up at Camping World/DandyRV in Anniston, AL. There are two pieces. A 3" male-male connector, and the 3" "standard" end.

Measure the 3" pipe to the Thetford end, and cut so that you end up with the same overall dimension after the new parts are installed.
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