How to install a bath tub plumbing trap

Bob meets Bob Hubbard, the plumber who is cutting into old cast-iron pipe with a snap cutter. The old P-trap is removed because the new tub has been moved to a new location, and therefore the P-trap will have to be moved also. They are replacing the cast-iron drain lines with PVC (polyvinylchloride) pipe which is pretty much the standard now. The plumber demonstrates how to glue or cement PVC fittings together with the proper glue, which sets up almost immediately. They replace the subfloor and are ready for the shower base. The shower base is custom-made to fit manmade marble. Bob installs the drain fitting which will make up to the S-trap that was just installed.