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 6645-01-026-6659
NSN 5910-01-468-5571
NSN 5945-01-010-4718
NSN 6110-01-400-4207
NSN 6610-00-197-7648
NSN 6650-01-319-3923
NSN 6620-01-239-3804
NSN 6150-01-437-9087
NSN 5915-01-204-1406
NSN 5945-01-632-6578
NSN 5950-00-918-8814
NSN 5960-01-441-7047