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 5945-01-631-2807
NSN 5965-00-912-9318
NSN 6135-01-433-2062
NSN 4140-00-965-7580
NSN 6685-01-419-9738
NSN 5990-00-543-2755
NSN 5945-00-175-8858
NSN 6650-01-594-9915
NSN 6620-01-400-2928
NSN 5945-01-571-4012
NSN 6650-01-254-3690
NSN 5835-00-778-5761