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Drat, you were right, that vent is only 1-1/2". Back to the drawing board...

(glad you mentioned it though Terry)

Terry, Uh oh, that's a really good point about vent size! I'm so glad you brought it up. I believe the vent is 2" already...but now I'm wondering. I will crawl back down under the house and check....

HJ--thank you for verifying my shower piping. The existing shower has its own separate vent now. I plan to remove that shower and use that to vent the toilet in its new location.

Existing shower...

Thanks for the great information Terry, Jim, and HJ. I must admit I do not fully understand the logic of the venting do's and don'ts so I very much appreciate the clarification on how to apply the...

HOORAY! This is the answer I was hoping for.

The toilet will be elsewhere and has its own vent. So it will just be the shower then the lav (both sharing the lav vent).

Thank you so much!...

Terry,

MUST the new shower drain tie in to the 2" vent (vertical or 45 deg) or would it also be acceptable to tie in farther east, into that horizontal 3" line that currently services the toilet?...

I'm doing a bathroom remodel in which I plan to swap the locations of the toilet and the shower. All of my DWV is ABS and it is located in an accessible crawl space below my single story house. I...