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Old 06-13-2014, 10:35 PM   #1
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Replacing my Grey Tank Empty Valve

Can someone give me some tips on switching out my grey tank valve?

I spent 4 hours trying to get the new one on and I am having a lot of problems. The gaskets just won't stay in place. I started the job about 2:15 today and gave up at 6. Somehow I managed to get the tank side gasket to stay in place, but when I tried the drain it was leaking like crazy on the drain hole side.

I could use any kind of tips anyone has - the pipes are all gules together pvc without a lot of flex - every time I slide the new valve in all the gaskets get unset.
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Old 06-13-2014, 10:41 PM   #2
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Just replaced my black water valve, same problem, used a little silicone grease, and held my breath and after about ten times got it in and bolted up. Good luck I know what your boing through.
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Old 06-13-2014, 10:51 PM   #3
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plumbers grease.........Home Depot or Lowes
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Old 06-14-2014, 10:07 AM   #4
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You could tape around the valve then fold it over the edge of the gaskets.

Make sure it only covers the edges.

You may need to slide paper in first to make faces smooth then after valve in place pull paper out
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Old 06-14-2014, 10:55 PM   #5
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Use a threaded spreader, or a pistol grip spreader/clamp, or even cut a small piece of wood to the right length to prop the two sections apart by slightly more room than the valve requires, perhaps an extra 1/4 or 3/8 inch or so. Fit it in pipe-to-pipe, or pipe-to-wall, just as long as the spreader is not blocking the valve location. Now you don't have to worry about holding the space open as you place the new valve. Hold the gaskets in place with the silicone grease, and just place the new valve in position. Now you can gently remove the prop while guiding the two pieces to proper alignment.

Took me a while to figure out how, then about three minutes to get it done.
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Old 06-16-2014, 11:32 PM   #6
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Buy a plastic place mat at Target or Walmart. Cut it into a couple of pieces about 5" wide by 10" long. Grease the slots where the two seals go, insert seals, cover both seals with the plastic place mat (like a sandwich) and insert between the two pipe ends. Once you have them squared up, pull out the place mats.
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Old 06-30-2014, 12:10 AM   #7
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Evidently my problem ended up being not a enough petroleum jelly. My father-in-law stopped by and couldn't get the thing installed either. He took some vasoline and lubed the snot out of both gaskets, but also all around the pipes and the valve. After we did that no leaks. The vasoline sealed all the leaks up nicely I guess.

The valves had no instructions, but I guess heavy use of lube was the key for me. If it starts leaking again i'll update the thread, but I think it is problem solved.
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Old 07-04-2014, 05:57 PM   #8
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Lube is good. When I have had trouble, it wad because the gaskets got deformed during installation. I think Dutch Star Don's idea is the best one I've seen. Thanks, Don.
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Old 07-06-2014, 08:25 AM   #9
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Quote:
Originally Posted by dropframe View Post
Evidently my problem ended up being not a enough petroleum jelly. My father-in-law stopped by and couldn't get the thing installed either. He took some vasoline and lubed the snot out of both gaskets, but also all around the pipes and the valve. After we did that no leaks. The vasoline sealed all the leaks up nicely I guess.

The valves had no instructions, but I guess heavy use of lube was the key for me. If it starts leaking again i'll update the thread, but I think it is problem solved.

The reason this works is only temporary.....rubber swells when subjected to hydrocarbons. It is only temporary, in a few months it will leak again.
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