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 5930-01-555-7848
NSN 5895-01-008-8842
NSN 5915-01-158-6864
NSN 6105-00-583-0265
NSN 6645-01-248-3123
NSN 7035-01-364-8454
NSN 5998-01-587-9059
NSN 5998-00-761-8201
NSN 6105-01-624-9902
NSN 7035-01-429-7954
NSN 5935-01-590-2982
NSN 7035-00-155-9513