- October 14th, 2014, 10:59 am#4814504
PVC drain pipe is measured from the inside diameter. If you bought one listed as 1.25", then outside diameter is actually 1.66". In the past we commonly used the pipe listed as 1", which has an outside diameter of 1.315", but that is still too big for this kit. You need a 1.25" OD tube. Your best solution is going to a metal supply store or ordering it online, but you can pick up a suitable pipe at Home Depot or Lowes, just check the sink tailpiece section. It will be really thin, but they have pipe in both PVC and metal that has the correct OD.