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 5915-01-191-9172
NSN 6620-00-225-4870
NSN 6105-00-193-0401
NSN 6645-00-279-1777
NSN 5965-00-970-6431
NSN 5985-00-649-8609
NSN 6320-00-405-2348
NSN 5950-00-225-9347
NSN 5910-01-658-2981
NSN 5990-01-408-6554
NSN 6620-00-394-1812
NSN 5935-01-417-1722