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?
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.
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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