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 5990-01-020-6841
NSN 6220-01-310-3772
NSN 7035-01-502-9967
NSN 5925-01-351-5541
NSN 5985-00-390-8837
NSN 6650-00-446-8787
NSN 6110-01-076-3585
NSN 4140-01-045-4112
NSN 5835-01-416-6455
NSN 5910-00-170-6784
NSN 5920-01-202-1982
NSN 6650-00-216-6365