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Old 03-02-2016, 07:14 PM   #1
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1976 25' Tradewind
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Bought the wrong kind of 90s

Replacing both of my leaky black water and grey water valves. So I figured just replace all the pvc fittings too. I bought, cut, and glued about $30 worth of 3 inch pvc only to discover the 90s I bought were sweeping 90s and not the short 90s that came out of the airstream. (76 trade wind) So none of the new pipe and valves line up with anything. The valves just bolted on so I just took those off. Everything else is in the trash. The uploaded pic is the old setup. Back to lowes to buy it all again. Click image for larger version

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Old 03-02-2016, 07:16 PM   #2
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I hacked it of at the Y so I could pull it out from under the floor.
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Old 03-02-2016, 09:31 PM   #3
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Plus, there are different degrees of "sweep".

When I do this sort of repair, I bring the original to the store and lay it on the floor to match up the new fittings. Don't ask me why.
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Old 03-02-2016, 09:34 PM   #4
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30 bucks isn't expensive for a plumbing lesson.

Label this one "Dry fit first".
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Old 03-03-2016, 12:03 PM   #5
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Quote:
Originally Posted by Siegmann View Post
Plus, there are different degrees of "sweep".

When I do this sort of repair, I bring the original to the store and lay it on the floor to match up the new fittings. Don't ask me why.
.
Plumbing has always given me fits. Heck, I could have a 1’ section of PVC and the dang thing would leak in the middle if I got a hold of it...

Now electrical, that I can understand...
.
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Old 03-03-2016, 02:24 PM   #6
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I did the same when I replaced the plumbing in my safari.

Also, the valves have to be on a bit of an angle for the handles to meet the holes in the frame and below the bumper. It looks like sloppy work until you put it all together.
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Old 03-03-2016, 04:49 PM   #7
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Seems to me that for waste piping, you should be using ABS pipe (Black) not white PVC.

Wider variety of elbows, sweeps, et al.

There is is reason why plumbers make big bucks.
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Old 03-04-2016, 12:30 AM   #8
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ABS is used because it is cheaper than PVC. Nothing wrong with using either.
Where I live you can not find ABS.
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Old 03-04-2016, 11:02 AM   #9
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Oh, and be careful of mixing the two. There is a special transition cement, but it's generally hard to find because I don't think it's residential code approved in most locations.
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