I use a Thedford to Valterra adapter on the outlet when I use my blue boy for grey water since it has a Valterra type connector and because of the way the hose stores a Thedford end would not work. I put a Thedford end on my sewer hose so when I have full service it hooks up to the outlet with no adaptor. My old 68 does not have a lot of room for the hose to bend and go down out of the bumper trunk so for that reason I don't use the adaptor unless I have to on the blue boy. Vintage Trailer Supply has Thedford adaptors.
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Bruce & Rachel
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68 Trade Wind
2001 Toyota Tundra
Reason being, no one stocks the 4inch cap. If it falls off while traveling not easy to replace. I have no other hose or couplings. I have no grey water tank either. So...
I have done the Tetford to Valvera conversion once. I went back to Tetford because there is less leverage on the fittings and fewer gaskets. Rasy solution would be to just order 2 caps fron outdoor mart. use one and carry one.
Just took the galley and furnace out seems like all of the 40 year old plastic is very brittle. I will look for the collector as well. The collector looked much newer than the cap though. The nearest Airstream dealer is over a 100 miles away(but so is Jackson Center). Ordering is the best way to go for me.
The waste system on most trailers is 3" not 4". You can buy a new Thetford termination cap. RVPlus has them in 2 styles.
I just bought one last week. They are cheap enough that you could buy 2 at a time. It helps not having to pay shipping twice if you lose one on the road.
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