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 5930-01-055-0596
NSN 6130-01-634-0603
NSN 5945-00-836-8599
NSN 6685-01-253-6014
NSN 6240-01-480-2448
NSN 6135-00-816-9052
NSN 6685-01-105-8999
NSN 6685-00-860-7561
NSN 6135-00-557-8874
NSN 5950-00-419-4370
NSN 5855-00-446-5921
NSN 5855-01-034-3845