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 4140-01-091-0270
NSN 5920-00-276-8657
NSN 5999-01-124-4465
NSN 4140-01-472-2768
NSN 5855-00-361-0167
NSN 6620-01-484-1303
NSN 6240-01-050-8306
NSN 6650-00-775-6560
NSN 6685-00-276-9889
NSN 5935-00-294-9526
NSN 5945-00-776-6910
NSN 6135-00-299-6918