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 5905-01-306-1159
NSN 6110-01-360-5661
NSN 5920-00-873-9514
NSN 6145-01-438-3748
NSN 5905-01-078-0353
NSN 6685-01-394-4141
NSN 6240-01-159-2633
NSN 6220-01-122-3155
NSN 5965-01-519-1929
NSN 6685-01-021-5863
NSN 6150-01-290-5315
NSN 6220-01-415-2351