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 6150-01-151-1262
NSN 7035-01-392-3097
NSN 5930-01-572-8315
NSN 5910-01-604-9544
NSN 5905-01-086-5547
NSN 6645-00-211-6906
NSN 4140-00-896-9602
NSN 5965-00-457-2496
NSN 5915-01-656-8877
NSN 5855-00-912-3885
NSN 5950-01-347-4384
NSN 5895-01-158-6357