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 2925-01-627-6568
NSN 6150-00-005-8579
NSN 6135-00-763-5793
NSN 6105-00-516-2151
NSN 6320-00-481-7291
NSN 5935-00-948-1596
NSN 2925-00-964-7128
NSN 5895-00-134-0879
NSN 2925-00-833-9466
NSN 6150-00-456-4526
NSN 5960-00-010-5300
NSN 5945-01-345-5184