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 5996-00-918-8300
NSN 6150-01-088-5111
NSN 6240-01-508-4146
NSN 7035-01-150-6303
NSN 5985-00-265-2942
NSN 4140-00-150-8265
NSN 5895-00-140-7845
NSN 6105-01-513-0310
NSN 5835-01-347-8714
NSN 5965-01-547-4779
NSN 6220-01-630-4807
NSN 6620-01-223-9157