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 5905-01-634-0595
NSN 5905-01-137-2257
NSN 5996-00-659-9187
NSN 6130-01-461-6072
NSN 5998-01-436-1627
NSN 5950-01-393-9222
NSN 6685-00-248-9125
NSN 6645-01-463-4314
NSN 5920-00-021-3697
NSN 6110-00-214-9186
NSN 6645-01-064-2749
NSN 5975-01-308-3017