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 6105-00-880-4492
NSN 6240-01-014-5598
NSN 5960-00-167-0397
NSN 6240-01-088-0389
NSN 5998-01-472-3277
NSN 2925-00-633-7223
NSN 4140-00-142-2491
NSN 5985-01-416-9441
NSN 6645-01-633-1852
NSN 6645-00-952-4509
NSN 6650-00-957-0714
NSN 5915-00-108-8542