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 6150-01-430-0332
NSN 4140-01-508-5152
NSN 6220-01-500-2935
NSN 5999-01-496-7801
NSN 5910-01-066-1892
NSN 2925-01-543-5571
NSN 5990-01-316-6344
NSN 5925-01-298-1989
NSN 6320-00-004-9158
NSN 5855-01-191-3404
NSN 6130-00-679-8891
NSN 6650-01-580-5459