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 2925-00-020-7524
NSN 4140-01-634-0330
NSN 5945-01-441-1861
NSN 7035-01-110-5745
NSN 6105-00-011-3671
NSN 6145-00-905-6797
NSN 5996-01-098-9101
NSN 4140-00-765-7748
NSN 5990-00-177-2924
NSN 6685-01-397-0117
NSN 6110-01-181-6216
NSN 6620-00-811-7614