Now you will make the final plumbing connection. Working from your access point, dry-fit the tailpiece from the new tub's overflow tee to the existing P-trap. You will likely need to cut a piece of PVC or ABS pipe to the correct length to join them. Use a pipe cutter or hacksaw for a clean cut. Once you are certain of the fit, apply PVC/ABS primer to the outside of the pipes and the inside of the fittings, followed immediately by the cement. Push the pieces together with a slight twist and hold for 30 seconds to allow the solvent weld to set. Ensure the P-trap is properly aligned to hold water.