A replaceable cylindrical item designed to provide wear surface and maintain alignment of a reciprocating valve stem and the like, it may have a flange(s) and/or grooves.
NSN 5998-00-128-8128
NSN 6220-01-152-2637
NSN 5975-00-045-1715
NSN 5930-01-377-3635
NSN 5950-00-932-5595
NSN 5965-01-446-6945
NSN 6610-01-355-8112
NSN 5935-01-492-5312
NSN 5835-01-476-8210
NSN 6685-01-336-9318
NSN 5835-00-551-3050
NSN 7035-00-870-0290