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 5910-00-218-1114
NSN 5915-01-188-5568
NSN 6145-00-466-4068
NSN 6650-01-311-3514
NSN 5925-01-578-5271
NSN 5895-00-387-4901
NSN 2925-01-169-9105
NSN 5920-01-559-7554
NSN 6650-01-103-7342
NSN 6240-01-517-6086
NSN 6105-01-069-7826
NSN 6320-01-493-4472