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 5999-01-139-9761
NSN 5910-01-027-1415
NSN 6685-01-161-1446
NSN 5930-00-335-2521
NSN 6150-01-034-1622
NSN 5996-00-960-9494
NSN 6320-01-277-5793
NSN 5965-01-442-7364
NSN 5930-01-473-4705
NSN 2925-01-136-2551
NSN 2925-00-066-9700
NSN 6145-01-364-0346