Reply To: Matching 1.5 in drain line to 1.25 in sink trap Home › Forums › Public Forums › General Plumbing › Matching 1.5 in drain line to 1.25 in sink trap › Reply To: Matching 1.5 in drain line to 1.25 in sink trap 17 Apr 2003 at 11:07 pm #294309 Retired plbg1Participant Depends what kind of pipe is there. If it is pvc are abs you get a 1-1/2″ female glue end slip adapter and they have washers inside to adapt to the trap.
