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 6130-01-418-2790
NSN 5975-01-542-8788
NSN 6150-01-192-2921
NSN 6650-00-710-8130
NSN 6610-00-186-9180
NSN 5960-00-892-3809
NSN 6110-00-014-8160
NSN 6105-00-635-9809
NSN 5975-00-054-9372
NSN 5965-01-212-6817
NSN 6650-00-789-8179
NSN 2925-01-384-4139