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 4140-00-689-6551
NSN 5999-01-332-6106
NSN 5945-00-228-6921
NSN 5999-01-599-5222
NSN 5950-01-345-3218
NSN 5835-01-281-1655
NSN 5950-00-555-2881
NSN 5996-01-415-3291
NSN 5855-01-407-2300
NSN 5935-01-258-2219
NSN 4140-01-445-3556
NSN 5945-01-546-3057