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 6220-01-316-0868
NSN 5950-00-929-7885
NSN 6610-01-336-2787
NSN 5925-01-022-9733
NSN 6650-00-283-0978
NSN 6130-01-330-6055
NSN 5935-01-161-5883
NSN 5950-01-214-0061
NSN 5930-00-116-4912
NSN 5975-01-174-8152
NSN 6105-01-634-0322
NSN 6610-00-783-8786