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 6685-01-634-0611
NSN 5920-01-532-3546
NSN 6620-01-567-4193
NSN 6320-01-343-2482
NSN 5915-01-364-5112
NSN 5960-00-592-4118
NSN 5996-00-842-9120
NSN 7035-01-533-9137
NSN 5985-01-618-2217
NSN 6105-01-562-1274
NSN 5998-01-055-3506
NSN 6105-01-305-1430