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Old 09-05-2014, 02:21 PM   #1
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1974 Argosy 22
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Waste gates leak- Valterra or thetford?

One of the surprises we had was that the black tank leaks liquid past the gate.
Someone, possibly PO cut away some of the underbelly skin to expose the access for replacing the two gates. I was hoping that meant they were already replaced, but no joy, I get to do it next spring.

So research shows there are two brands, and since LaTortuga was born in '74, which ones will I need?
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Old 09-05-2014, 02:49 PM   #2
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Savage,

White = Thetford, black = Valterra. If not modified by a prior owner it should be Thetford.

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One of the surprises we had was that the black tank leaks liquid past the gate.
Someone, possibly PO cut away some of the underbelly skin to expose the access for replacing the two gates. I was hoping that meant they were already replaced, but no joy, I get to do it next spring.

So research shows there are two brands, and since LaTortuga was born in '74, which ones will I need?
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Old 09-05-2014, 03:25 PM   #3
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Yes, if it is white, it is Thetford. Some have said that they think that the Valterra are superior in some ways, but I can't recall why. The Valterra equipment is much cheaper and everyone carries it. The Thetford is harder to find and much more expensive. Rangtash Brothers in Missoula has and can get for you most any Thetford parts you want. Other dealers look blank when you ask for Thetford things.

If you are replacing you might consider converting to Valterra if it is not a huge additional job. That advice is based on availability and cost considerations only. My long experience with Thetford has been positive as far as how it works.
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Old 09-05-2014, 06:25 PM   #4
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Before you replace, work a few tanks of water and mild detergent through and open/close the gate rigorously as it emptying. This fixed mine.
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Old 09-06-2014, 02:37 PM   #5
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You can also rebuild Thetford (and Valterra). It is a matter of replacing the rubber seals that the blade slides through. This is much easier than replacing the valves with the attendant pipes and plumbing to be done. Check with Inland or other AS parts folks for rebuild parts.
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Old 09-06-2014, 08:45 PM   #6
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I was told by a Thetford tech last year that they are starting to phase out the gate valves.
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Old 09-06-2014, 10:24 PM   #7
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Our 2005 Classic 30 came with a Thetford. Our 2008 Classic 34 came with a Valterra. Both were purchased new from a dealer.
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Old 09-07-2014, 07:40 PM   #8
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There is also this, which I never new existed but found on another site whilst looking for something else (as you do)
Twist-on Valve - Valterra T58 - Sewer Fittings & Adapters - Camping World
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Old 09-08-2014, 08:57 AM   #9
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We thought about one of those, but it's a bit more complex because you have to get a Thetford to Valterra adapter in order to fit it on. For some models -- ours included -- space is limited, making the solution unworkable.

Lynn

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There is also this, which I never new existed but found on another site whilst looking for something else (as you do)
Twist-on Valve - Valterra T58 - Sewer Fittings & Adapters - Camping World
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Old 09-26-2014, 09:00 AM   #10
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I thought my valve was leaking too. I pulled it out and rebuilt it. It still leaked. Further inspection showed the leak was actually a crack beside the tank hole. Not the valve but beside it in the actual tank. Project was put on hold when we figured this out, about 2 months ago. I plan to try to plastic weld it to fix the problem. Or buy a new tank.


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Old 09-26-2014, 09:26 AM   #11
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My Thetford valve on the gray water tank was leaking on my 86 Limited. It also had the special Thetford bayonet connector that required special slinky hoses and caps. I found the Thetford sealing design was more complex than the Valterra.

I switched to Valterra valves and have been satisfied these last two years. No leaks, and I can use standard 3" slinky hoses and caps. It was a significant amount of work to drop the big tank cover pan. Airstream designed it this way to keep the tanks from freezing when used in cold weather, but it isn't the greatest for maintenance. The new Valterra valves are on top in the photo.

David
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Old 09-27-2014, 06:45 AM   #12
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I do believe that the new trailers are all coming with Thetford.
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Old 11-03-2014, 06:28 PM   #13
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waste valve access

I have an '85 Excella. My grey water tank valve is leaking, so I want to replace both valves. Do I have to unbolt the entire waste tank shield, or cut out an opening big enough to replace the valves? If so, what tool cuts this best?
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Old 05-30-2016, 09:10 AM   #14
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thetford valve issues

Okay, I have tried to do some research here and so far it looks as though my '91 Excella 1000 has the Thetford design. So my problem is that the black water tank valve seems to be stuck slightly open so when I go to empty the tank I have to be very quick to connect hose or it drains that nasty stuff before I open the valve. Not a lot mind you but enough to be embarrassed and concerned.

Seems to me that there is a way to adjust the valve stem so it will not leak. I understand from other comments that perhaps the valve is partially stuck open and that pushing and pulling the valve while dumping might free it up.Not ready for the conversion or full on repair yet but will do it if all else fails. Problem we are on the road for the next 2-3 months and finding a place for this supposedly messy job is problematic.

Standing by for tips/advice.
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