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 6220-00-186-8565
NSN 5975-00-249-7940
NSN 6150-00-027-9279
NSN 5915-00-879-6283
NSN 5835-01-608-4285
NSN 5855-00-014-5008
NSN 5998-01-188-8947
NSN 5930-00-502-3293
NSN 5915-01-313-4612
NSN 5835-00-446-2944
NSN 5930-00-471-2549
NSN 5950-01-054-3215