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 6110-01-619-3961
NSN 6240-01-112-7577
NSN 6650-01-398-7323
NSN 5998-01-433-1621
NSN 5925-01-195-1218
NSN 6110-01-491-6177
NSN 5915-00-144-5548
NSN 6685-00-642-0533
NSN 5855-01-364-9810
NSN 5835-01-509-8992
NSN 6645-01-415-3894
NSN 5965-01-246-6162