#21 Nordyne Orifice 661021
Nordyne orifice #21. Also known as drill size 0.1590.
Hex head is 7/16", length is 7/16", threads are 1/8-27 NPT.
Picture is for reference only. Hole size will vary on actual item.
Replaces part #660890, 660554, 1065530 & 106553.