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 5855-01-393-2455
NSN 6220-01-523-0869
NSN 2925-01-545-2717
NSN 2925-01-263-3638
NSN 6650-01-016-0406
NSN 6105-00-300-3217
NSN 5960-01-384-4603
NSN 5998-01-420-5846
NSN 6320-01-017-5274
NSN 5990-01-583-2870
NSN 5855-01-417-3250
NSN 5920-01-480-4360