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Old 02-10-2014, 02:27 PM   #1
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Thalweg's Avatar
1962 24' Tradewind
Buffalo , Wyoming
Join Date: May 2012
Posts: 474
Plumbing Vent Problem

When I bought my 1962 Tradewind, the all the bathroom fixtures were missing. Iíve recreated everything as close as I could to what it was originally. I got a new pie shaped black tank from VTS, built a new cabinet, and plumbed the supply lines. Now Iíve got to plumb the vents. I have the original vent stacks in the closet next to the bathroom. Itís shaped like an upside down Y, with one leg to vent the black tank, and the other to vent the drains. The black tank vent is easy. The drain vent is a problem. The pipe has to pass over top of the black tank to reach the vent stack in the closet. Iíve got to build a platform for the toilet to sit on over the black tank. So I figure I could either put the vent pipe below the platform, which would require elevating the platform more, or I could run the vent pipe along the back wall above the platform. The existing vent pipe is 1.25Ē diameter. My question is; is there any reason that I need to stick with that large of pipe for the vent? Would there be a problem with reducing it down to about ĺĒ where it passes over the black tank? This would allow me to raise the platform much less than with the 1.25Ē pipe.

Additionally, if I am able to put the pipe below the platform, Iíve got another problem to contend with. The black tank has a 3Ē female threaded fitting for a male threaded toilet flange to screw into. I canít find an adapter to allow me to raise that.

Iím sure Iím not the first one to have these problems. So Iím curious how others have handled them.
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