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 6110-00-081-0927
NSN 5935-01-435-5188
NSN 5965-01-201-1580
NSN 6135-01-315-9214
NSN 6650-01-024-9554
NSN 5999-00-061-5154
NSN 5990-00-332-1735
NSN 6110-01-309-7946
NSN 6610-00-958-0294
NSN 6685-01-431-7927
NSN 5990-01-426-7350
NSN 6105-01-148-1131