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 6105-01-065-0341
NSN 5990-01-423-2219
NSN 5965-01-509-2873
NSN 4140-01-392-8068
NSN 5996-01-433-2777
NSN 5915-01-566-3494
NSN 6220-01-431-7319
NSN 5990-01-423-8189
NSN 6110-00-635-2091
NSN 5935-00-497-0900
NSN 6645-00-719-5511
NSN 5855-01-418-6303