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Old 03-03-2015, 11:03 PM   #1
retired cop's Avatar
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Valterra valve seal replacement

On my maiden voyage in the Minnie I noticed a slight leak coming from the 1-1/2" Valterra valve connected to the gray water tank. Rather than try to find the cause of the leak, I bought a new valve and replaced the whole thing. Had a lot of trouble trying to keep the new seals in place while installing the valve. After replacing the valve I found that I still have a leak, so I took the valve out today and found that the seals had not stayed properly seated and that I had boogered one of them up. I have now ordered replacement seals.

My question is this: Do any of you motorhome gurus know a secret to keeping the seals in place during installation? I am considering using a very small bit of silicone to hold them in place. Is this a good idea, or does someone know of something better?


Ken and Deanie (with Ralph the cat)

2002 Winnebago Minnie, 331C, Ford E450 chassis
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Old 03-04-2015, 03:23 AM   #2
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Get a partner to help spread the pipes apart and slide the assembly into place. I use silicone grease to hold the seals onto the closed valve assembly. Get the screws finger tight and operate the valve a few times. Then tighten the bolts slightly with wrenches; do not over tighten. Leak test and tighten bolts if needed to stop any leaking. Good luck and keep us posted.

Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
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Old 03-04-2015, 02:23 PM   #3
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One hint if you don't have a helper. Some glue clamps can be reversed and used as a spreader. Makes the installation much easier.

Have a nice day - Darrel
2007 3912 KSDP w/350HP ISL Cummins
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Old 03-04-2015, 09:29 PM   #4
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RV Wizard: Appreciate the info about the silicone grease, I think this will probably solve the issue (after I modify the valve housing a little).

Darrel: Thanks, but the problem is not being able to spread the pipes, but rather keeping the seals in place while reassembling the unit.

New seals are on order and should be here in a week or so. I'll let y'all know how it comes out.
Ken and Deanie (with Ralph the cat)

2002 Winnebago Minnie, 331C, Ford E450 chassis
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Old 03-04-2015, 10:33 PM   #5
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Why are you ordering just seals? The whole assembly is only $15.00!

Take either a plastic milk carton and cut the sides out. Sandwich the assembly between the two carton sides and insert. Once in place, pull the plastic carton sides out.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
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Old 03-05-2015, 09:06 AM   #6
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You can wrap tape around the outside to hold seals in place.

Aviation form a gasket works well too but sticky nasty stuff and just a tiny bit needed to bond gasket to valve.

Then use file folder or other thin stiff whatever to make a barrier between valve and flange so gasket does not get snagged and dragged off.

Tony & Lori
1989 Country Coach Savannah SE
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replace, replacement, seal

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