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 6150-01-006-4590
NSN 6645-01-265-0648
NSN 5999-00-754-8197
NSN 5965-01-471-3278
NSN 6110-01-406-3623
NSN 5915-00-136-7698
NSN 6650-01-139-0022
NSN 5895-01-094-5689
NSN 5985-00-652-1631
NSN 5920-01-135-9261
NSN 6110-01-096-6084
NSN 6105-01-469-3486