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 6610-00-139-1105
NSN 5996-00-648-2490
NSN 6105-01-519-8003
NSN 7035-01-643-4593
NSN 5910-01-147-4902
NSN 5935-01-653-5764
NSN 5965-00-932-4591
NSN 5855-01-333-9606
NSN 5945-00-303-5313
NSN 5996-01-435-5547
NSN 5985-00-583-5365
NSN 6650-00-824-0745