The LAV stop connects the same way as the water lines. Confirm that there are no leaks underneath the tub. Complete the cut through both marked spots on the pipe with the hand saw. Utility sinks once were commonly called laundry sinks because they were for washing clothes. Put the vertical opening of the P-trap under the drain pipe in the bottom of the utility sink and mark the point where the horizontal pipe meets the rough drain pipe.
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How To Install a Utility Sink
Using a masonry bit, drill a hole in the wall behind each pipe. Tighten with a wrench while backing off with another. Utility sinks require a little bit of plumbing knowledge to install correctly. Finally, put the sink and faucet into place. Then spread PVC cement inside the larger ends of the wye fitting. Here is what I am picturing provided that the capped pipe does need to be tied into the existing vent.