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Old 03-14-2016, 01:23 PM   #1
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Location: Albuquerque, NM
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Waste plumbing issue

1986 Winnebago 27RT

This RV has three waste tanks, one black; two gray. The black tank was full and yesterday I emptied about 3/4 of it using a bucket and dumping it down the toilet. Not very elegant, but it worked. Today I noticed a small drip from the valve and pushed a little on it, thinking it wasn't completely closed. The valve and the coupler connected to it that goes to the tank fell out and covered the ground (and me some) with the remains of the tank. Fortunately I had emptied most of it already. I cleaned that up and started looking closer at what's underneath.

From the outside, the first tank is a black waste tank with a 5" fitting. Next to that is another tank with a smaller fitting. Shower maybe? The vanity sink drain seems to run to the black tank as I ran water and it came out the open 3" fitting. The third tank must be for the kitchen sink. Winnebago doesn't have any plumbing drawings.

So what I have to put back/replace is the shutoff valve and the coupler between it and the tank. I also have a rubber gasket than fell out of one end or the other, I'm guessing it goes next to the valve, the valve attaches some how and the coupler attaches by tightening the metal pipe clamps.

Does this sound correct? And do I need any kind of plumbing or joint compound when putting this back together?


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Old 03-14-2016, 01:31 PM   #2
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Location: Orange, CA
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I replaced a valve on the TT that I had. I think the rubber gasket probably goes next to the valve but I can't remember for sure. You'll know when you get the replacement. Mine came with all the parts and instructions. Good luck and safe travels.

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Old 03-14-2016, 04:24 PM   #3
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If anyone is interested, here's how it's put together. From the tank there is a rubber coupler that connects it with a 3-1/2" section of pipe, which is in turn glued inside a female 3" coupler. The couple is fastened to the shutoff valve, the other side is bolted to a flange that was fitted over the curved section leading to the output opening. It's that flange that broke. Since that flange is part of the pipe assembly, replacing it means replacing the pipe. Unfortunately it has another smaller valve on the other side that has to come off and the bolts won't budge. There are also three different pieces glued in line on the "out" end of the pipe.

Note: I noticed I typed 5" in my initial post when I meant to type 3".
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