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 5855-00-079-2370
NSN 5915-01-245-8157
NSN 6620-00-239-6153
NSN 6320-01-630-7629
NSN 5996-01-109-9327
NSN 4140-00-365-2531
NSN 2925-01-253-6006
NSN 5915-00-177-2676
NSN 5930-01-384-2820
NSN 5999-00-087-0258
NSN 5930-01-406-5243
NSN 6320-01-652-3806