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 5965-00-554-4138
NSN 5925-00-410-1453
NSN 6150-00-425-2607
NSN 5990-00-980-7808
NSN 5910-00-251-0598
NSN 6320-01-313-2709
NSN 6150-01-128-4487
NSN 6110-01-102-0222
NSN 6620-01-517-0014
NSN 5965-01-071-3704
NSN 5985-01-505-9548
NSN 6320-01-098-2503