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Unread 11-27-2020, 06:51 PM   #16
wwhitney
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I just measured the trap on my vanity--it's a 1-1/4" chrome p-trap, and left to right the sink tail piece is basically liked up with the trap adapter sticking straight out of the wall. The centerline of the tailpiece is a little under 5" from the face of the compression nut on the trap adapter. 4" wouldn't work, 4-1/2" might fit (not sure).

Not 100% clear on what you have, a picture labeled with distances from the wallboard would help if the above information is not sufficient.

Cheers, Wayne
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Unread 11-27-2020, 09:49 PM   #17
SpaceCadet
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There's no wallboard yet, Wayne. It's pretty much in the same state as what's in the picture in post 13 of this thread. The sink is 24"x14" with the drain hole 6-1/2" from the back. If they're piping to it with PVC, they'll have to go off to the side first then p-trap back over.
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Unread 11-27-2020, 10:44 PM   #18
wwhitney
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So what's the exact left-right offset between the san-tee center line and the sink tailpiece center line? You've got basically three options without any additional elbows:

1) Remove the rubber coupling and solder on a trap adapter. Could be a female trap adapter (hopefully there's a pipe segment with enough projection), or a male trap adapter if you desolder the pipe segment from the san-tee (assuming that would project into the cabinet sufficiently).

2) Keep the rubber coupling, but replace the PVC pipe with a male PVC trap adapter (spigot end). The spigot end may only be 5/8", while the rubber coupling probably wants 1", so you'd have to check it would seal OK, and you might put a 3/8" spacer offcut of pipe in there.

3) Keep the rubber coupling and a PVC pipe segment and glue on a female PVC trap adapter (hub end).

Given the 6-1/4", you'll have to take some measurements to be sure, but there's a good chance that option (3) wouldn't work if the sink tail piece centerline is within 2" of san-tee centerline. If it's over 2", you have the option to let the PVC pipe run out past the sink tailpiece and have the p-trap u-bend pointed away from the wall.

I guess there's also option (4), which is put a couple 45 degree bends in the sink tailpiece, but that seems less desirable. There are also options putting a bend on the horizontal trap arm, likewise a bit more trouble.

Cheers, Wayne
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Unread 11-28-2020, 10:42 AM   #19
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The left-right offset of the drain from the sanitary tee (actually it's just a regular tee but the inspector didn't seem to have a problem with it) is flexible because the walls and the floor aren't actually up yet but in a desirable layout it would be 1/2" to 1" offset.

Sounds like it's doable one way or another, that's mainly what I'm after. A plumber is doing this. I'm in MA and we're not allowed to touch the plumbing without a license. I just want to make sure I'm not building something that's going to be impossible to hook up later.
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