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 5950-01-054-6161
NSN 5925-01-185-5436
NSN 5960-00-451-5070
NSN 5965-01-205-6249
NSN 5925-00-081-1170
NSN 6685-01-506-0097
NSN 5915-00-040-8734
NSN 5999-01-495-0998
NSN 5835-01-642-4705
NSN 5935-01-539-4689
NSN 5990-01-588-3999
NSN 7035-01-421-2398