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 5975-01-392-0436
NSN 6685-00-869-0584
NSN 5950-01-444-0112
NSN 5895-01-118-3520
NSN 5985-00-079-2748
NSN 6645-01-483-1518
NSN 5960-01-538-2082
NSN 6610-01-521-9801
NSN 4140-01-080-0513
NSN 6150-01-524-0662
NSN 5990-01-174-6851
NSN 6320-00-116-3658