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 5950-01-247-5390
NSN 4140-01-180-8343
NSN 5895-01-543-3235
NSN 6650-00-927-3391
NSN 5935-00-919-9378
NSN 6610-01-347-3397
NSN 5935-01-650-3549
NSN 5915-00-139-1628
NSN 2925-01-121-3355
NSN 6130-00-596-9565
NSN 6685-01-487-4209
NSN 6145-00-290-3859