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 2925-01-525-2106
NSN 6220-01-441-1271
NSN 5930-01-650-2552
NSN 6620-00-018-2196
NSN 6130-00-611-2447
NSN 5985-01-462-0144
NSN 6135-00-962-4111
NSN 6685-01-353-9083
NSN 5985-01-623-3347
NSN 6240-01-462-4812
NSN 6135-01-382-9278
NSN 6240-00-553-8891