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Old 09-22-2010, 05:43 PM   #1
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How to tie a new vent into an existing?


Here's the deal, I am upgrading my tub to a stall shower so I need to upgrade the plumbing from the current 1 1/2" to 2". The existing drain goes horizontally over to the toilet stack, but I am not opening that wall up so I would like to cap that off and run a new drain down to the basement. I would also run a new 2" vent pipe up into the attic where there is an existing 2" vent pipe running horizontally.

I planned on cutting a sanitary Tee into that existing horizontal vent pipe and running the new vent into that.

Will that be OK?

If so, which way I should I face the sanitary Tee? So that the fumes can go up smoothly or so that the rain water can flow down smoothly?

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Old 09-22-2010, 07:34 PM   #2
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How to tie a new vent into an existing?


You can pipe it as you described. you can also vent a shower with 1.5"
When placing vent fittings, think like water. You want to drain back to the drainline.

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