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 6150-01-462-5674
NSN 4140-01-529-6811
NSN 6220-01-373-9861
NSN 5945-01-018-9842
NSN 5905-01-528-7879
NSN 6620-01-053-6650
NSN 5985-00-399-1174
NSN 5960-01-454-6657
NSN 5998-01-206-4672
NSN 6320-00-636-0922
NSN 6145-01-327-3328
NSN 5965-00-267-4173