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 6620-00-809-5156
NSN 6145-01-159-9344
NSN 5999-01-055-4306
NSN 2925-01-228-6554
NSN 4140-01-013-6807
NSN 6620-00-527-9280
NSN 6610-01-633-8931
NSN 5950-00-432-7708
NSN 2925-01-631-7004
NSN 5999-00-592-4740
NSN 6135-00-583-3966
NSN 6145-01-124-0035