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 5950-00-246-5277
NSN 5960-01-076-9930
NSN 5985-01-204-8827
NSN 6645-01-084-7453
NSN 6650-00-456-1736
NSN 6240-01-497-9574
NSN 6645-01-650-5735
NSN 5999-01-495-5685
NSN 5990-01-351-2379
NSN 6150-01-619-5050
NSN 6645-00-539-1705
NSN 5960-01-375-1905