Hi. I'm Fred. I'm putting in a new electric service, 100 A/240 V. I need to manually thread a 1 1/4" pipe Nominal Pipe Size (NPS). I'm not sure if it is tapered or not tapered. My question is: what size die do I need to threat the pipe? The outer diameter (OD) of this pipe is 1.9". Is that the die size. Thank you very much for any help.