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 5999-01-441-2320
NSN 5996-00-621-3048
NSN 5920-00-333-9977
NSN 6645-01-370-4259
NSN 5920-01-320-3542
NSN 5975-01-593-3130
NSN 6650-00-482-6155
NSN 5975-01-338-2305
NSN 5965-00-876-2378
NSN 5925-01-508-4145
NSN 6650-01-451-1372
NSN 6135-00-432-8779