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 5945-00-445-9809
NSN 6220-01-418-0383
NSN 6650-01-426-4253
NSN 5835-00-892-3510
NSN 6685-01-269-5240
NSN 6645-01-494-3845
NSN 5990-01-287-9447
NSN 5930-01-172-7361
NSN 5960-01-213-6292
NSN 5910-00-044-5716
NSN 6620-01-504-5756
NSN 7035-01-132-7209