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 5945-01-101-2286
NSN 6620-01-531-2341
NSN 5998-01-153-1179
NSN 6110-01-647-8070
NSN 6105-01-230-5012
NSN 5985-01-308-3688
NSN 6240-00-738-1878
NSN 5998-01-356-1491
NSN 5945-00-411-8827
NSN 5998-00-014-8318
NSN 5996-01-408-1002
NSN 2925-00-051-1467