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 6620-01-208-1092
NSN 5905-01-528-9209
NSN 5960-00-491-1463
NSN 5996-01-539-1351
NSN 6610-00-202-5481
NSN 7035-00-631-3782
NSN 5895-01-527-3829
NSN 6145-01-470-1151
NSN 6150-01-540-7897
NSN 6610-01-396-2484
NSN 4140-01-415-3363
NSN 6105-01-181-4444