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 5930-01-243-0629
NSN 5998-01-633-0807
NSN 5920-01-608-3962
NSN 5960-00-165-3038
NSN 6240-01-106-0950
NSN 5960-01-552-0862
NSN 5999-01-257-7600
NSN 6105-00-903-2014
NSN 5895-01-580-0283
NSN 6105-01-584-9748
NSN 6650-01-630-2223
NSN 6145-01-571-0921