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 6130-00-519-6192
NSN 5925-01-037-5170
NSN 5945-00-682-9759
NSN 6620-00-244-0965
NSN 5910-01-500-1388
NSN 6685-01-476-2045
NSN 5910-01-521-3684
NSN 5975-01-393-1095
NSN 5975-01-008-9957
NSN 5975-00-137-2836
NSN 5835-00-894-7374
NSN 5920-00-800-8998