If you use a shielded coupler, the coupler has to grab something that is pipe-sized on each side. That thing on the right would be the pipe, cut to at least just over an inch long, out of the stud.Hmm, I thought the purpose of the street elbow was to a avoid using a short piece of pipe? The existing pipe goes right into one end of the shielded coupling, then the street elbow goes into the other? Now I am getting confused, but I think if I buy a bunch of fittings I can probably just piece it together
On the left, it would either be
- the spigot output of a street bend
- a piece of pipe sticking out of a hub-hub bend by a little over an inch.
Picture yourself putting it together. Hook up the lower right. Hook up the vent pipe up top. Which of those things would you do first, and which would you do last, as you picture the process?
Now it could well be that you could just glue a hub to the piece of pipe near the stud. But you have to get it right the first time. You also have to figure out how you make the hookup to the vent pipe. If you were a plumber, you could probably get it right the first time. Or you use a shielded coupler, where you will have the ability to rotate into position, take it back out, re-do something, and put it back. What redo? For example, maybe file a pipe 1/16 inch shorter to make things line up.
I would probably plan to use two shielded couplings -- lower right, and up at the vent, both. You may be able to glue one. You probably cannot glue both.
How far is it from the centerline of the vertical vent pipe to the stud on the right? That can help identify your options.
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