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 5895-00-706-9451
NSN 5905-01-246-0572
NSN 5835-01-446-6065
NSN 5998-01-236-7077
NSN 6240-00-080-2012
NSN 6645-01-515-1978
NSN 7035-01-140-8916
NSN 6220-01-634-0660
NSN 6150-01-211-4755
NSN 5930-01-247-8969
NSN 6620-00-144-7201
NSN 6220-00-111-0921