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 6130-00-239-3594
NSN 5935-01-189-8744
NSN 6150-01-655-3816
NSN 5905-01-163-3120
NSN 5895-00-833-2525
NSN 5935-00-068-7939
NSN 5835-01-038-8037
NSN 5945-01-407-2552
NSN 4140-00-099-9205
NSN 6645-01-034-0469
NSN 5930-01-352-9885
NSN 6645-01-160-7707