calibrating a bath tub P-trap set in concrete
Measure to center of tub drain, that is center from the side wall, now 99% of the time the trap will line up on the very edge of the inside wall, then make up the drain for the tub once you get lined up.
If you have to offset to the tub drain tee or down to the trap, it's ok to do an offset.
Fix it right the first time, so you won't have to fix it a 2nd time.
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