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 5999-01-634-0576
NSN 5855-01-420-4988
NSN 6320-00-931-4855
NSN 5855-01-398-3181
NSN 5895-00-370-0594
NSN 5855-01-364-1005
NSN 5996-00-278-5193
NSN 5985-01-339-2510
NSN 5935-01-021-4611
NSN 4140-01-089-8004
NSN 4140-00-523-0410
NSN 4140-00-314-1025