Good evening Everyone's help on this forum has been amazing. I need to order both final drive drain plugs for my D47U1. My parts catalog (if I'm reading it correctly) say the part number is 1B5170. Is that correct. Also are the threads npt. It appears to be a tapered plug. I didn't see a copper washer in my parts book for the plugs like the engine oil or tranny fluid requires thank you
NPT
Thank you.