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Old 03-21-2009, 11:25 AM   #1
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1975 25' Tradewind
Holland , Michigan
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Sealing drain pipe to black and grey tank

Do I need to put any kind off sealant on the drain pipe where it connects to the grey and blank tank or is the hose clamp all that I use.
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Old 03-21-2009, 12:40 PM   #2
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1989 34.5' Airstream 345
Cleveland , Tennessee
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Not quite sure what the question is but here goes my guess. The flexible hose to the quick connect fitting used for dumping does not need any sealant. The waste water flows out via gravity & is not under any pressure. I check the tightness of the clamp on occasion as I had a near problem once. As soon as I pulled the dump handle, I saw the flexible hose & clamp start to slide off. Grabbed it quick & held it till dumping was complete. Then tightened the hose clamp when done.
There's no sealant needed on the connector that the connects to the dump fitting either. This should be seal with an "O" ring on the connector.
I like to use the Valterra connectors that just screw right into the hoses without any type off clamp. The only clamp on my set up is the connector that attaches to the dump fitting with a 1/4 turn at the begining. Maybe when my current Thetford peice breaks I'll look for one with an adapter.
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Old 03-21-2009, 05:03 PM   #3
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1975 25' Tradewind
Holland , Michigan
Join Date: Sep 2008
Posts: 235
On the black tank the dump valve connects directly to the tank, slip fit and held in place by a hose clamp.
The grey tank is the same but with a ABS plastic pipe fitting into the tank.

How do I seal the dump valve to the black tank and the ABS pipe to the grey tank. I know there not glued but the hose clamp does not seem sufficient to prevent leaks, I could be wrong it's happened once before.
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Bruce,
Parts needed: Fan for roof vent or whole vent fan assembly, vented catalytic heater.
My blog for the 1975 Tradewind restoration, Has not been updated in a while but I am still working on it.
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Old 04-02-2009, 09:05 AM   #4
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1978 31' Sovereign
Cincinnati , Ohio
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I am also in need of the same information. I have a 78 Soviergn and I am chucking all the Thetford stuff and putting all new Vallterra stuff on it. When I took the old Thetford valve off the tanks, it looked like some sort of sealent was used between the valve body and the tank. When I place the new spigot, the piece that the valve attaches to, into the tank, it is a fairly tight fit. You then use a clamp to compress the tank onto the spigot. Does the tank have enough elasticity to provide a good seal between the spigot and plastic tank? Even though you can compress the plastic tank, I would think that something else would be used. I was thinking about using some plumbers putty on the outside of the spigot and having it at the joint between the end of the tank and the spigot. Any suggestions?
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