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 5920-01-008-8501
NSN 5935-01-062-7885
NSN 5950-01-076-5052
NSN 5835-00-233-6327
NSN 4140-01-190-5150
NSN 5910-00-944-0935
NSN 5855-00-427-7848
NSN 6150-01-424-0229
NSN 6150-01-025-5833
NSN 5960-01-217-4526
NSN 5945-01-445-5537
NSN 5835-00-433-8540