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 5996-01-480-2204
NSN 5996-01-220-3203
NSN 6685-01-007-8578
NSN 5935-00-540-3092
NSN 5950-00-900-4839
NSN 5915-00-852-0321
NSN 5990-01-174-4469
NSN 6145-01-074-7541
NSN 6320-01-270-1419
NSN 6135-01-180-9611
NSN 5935-01-481-4018
NSN 5930-00-126-3428