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 5905-01-158-1474
NSN 6150-01-387-0713
NSN 5930-01-525-6503
NSN 6610-01-579-9646
NSN 5996-01-422-5495
NSN 6650-01-508-3651
NSN 5945-01-184-2470
NSN 5999-01-406-0276
NSN 6650-01-540-5157
NSN 6150-01-604-4515
NSN 6685-01-481-9705
NSN 7035-00-166-0339