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 5990-01-416-6009
NSN 5925-00-411-0843
NSN 6130-01-535-0952
NSN 5960-01-142-1995
NSN 5960-01-430-3911
NSN 6130-01-383-2587
NSN 5998-01-121-6468
NSN 6685-00-553-8733
NSN 5930-01-593-9370
NSN 7035-00-703-3535
NSN 5960-01-468-6508
NSN 5910-01-403-2812