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 5905-01-392-4881
NSN 5990-01-191-9624
NSN 5975-01-170-8956
NSN 6620-01-067-9285
NSN 5895-01-570-3900
NSN 6130-00-918-1544
NSN 5975-00-618-8194
NSN 4140-00-473-2324
NSN 5835-00-589-6300
NSN 5895-01-264-4067
NSN 6135-01-350-2932
NSN 6620-01-147-5615