Old's Cool Choppers
Petcock - Washer flat used between the nut and the crush washer
this is used to prevent the rubber / fiber from being damaged from the turning of the nut.
FIts over all 1/4 npt thread bungs
Fits the uk Style petcock
part # 83-0002
Install with with crush washer washer part # 70-7351 (SOLD SEPARATELY)