Install a drain connection for the new sink, this means cutting out the old stack and installing a new wye, studor vent, and trap assembly. replace the disposal collar, hook up the new faucets, verify there are no leaks and everything functions perfectly. Will have to return Monday to replace the p trap. I have tried several different tubular traps and all have leaked at the same point. My client had to leave before I could go and grab this. Left a bucket underneath in the meantime Range company came out to hook up gas and venting for the new stove. I detected a gas leak after they left and ended up replacing the gas whip as a courtesy