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 5965-01-528-4531
NSN 5999-01-366-6961
NSN 5996-01-596-3039
NSN 5998-00-182-2989
NSN 6130-00-133-3521
NSN 5965-00-076-9561
NSN 5960-01-224-7151
NSN 5965-00-959-4910
NSN 5910-01-166-7212
NSN 5835-01-241-1090
NSN 6150-00-372-5979
NSN 4140-00-631-1504