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 5999-00-308-6517
NSN 5996-00-535-5889
NSN 5950-01-353-2884
NSN 5905-00-914-2982
NSN 6145-01-543-5439
NSN 5999-01-576-4809
NSN 6130-01-352-0771
NSN 6320-01-380-0561
NSN 6320-00-731-6134
NSN 5998-01-192-1311
NSN 6135-01-255-9129
NSN 6220-00-383-4474