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 5835-01-215-5961
NSN 6645-00-522-4173
NSN 5905-01-267-2584
NSN 6620-01-412-0938
NSN 5835-01-033-8756
NSN 5910-01-594-6577
NSN 6610-00-244-2816
NSN 6645-01-503-2240
NSN 6650-00-166-7160
NSN 6320-00-731-6134
NSN 5855-01-110-9564
NSN 4140-00-574-1869