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 5996-01-383-7018
NSN 6320-01-344-6511
NSN 6150-01-627-3783
NSN 5905-01-651-5060
NSN 5999-01-513-9944
NSN 6620-00-079-0311
NSN 5930-00-951-9732
NSN 6150-01-323-9441
NSN 5915-00-195-8761
NSN 6105-01-546-7832
NSN 5835-01-131-2027
NSN 4140-01-146-5409