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 6220-00-015-4231
NSN 6145-01-025-1372
NSN 6105-00-244-5197
NSN 5935-00-622-2829
NSN 6110-01-398-6928
NSN 5975-00-240-5380
NSN 5985-01-429-7173
NSN 5895-00-233-7309
NSN 6240-01-248-9911
NSN 6320-01-116-3980
NSN 6105-01-374-4794
NSN 5990-01-249-8212