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 6240-00-269-3346
NSN 5895-01-007-1235
NSN 5895-01-654-6658
NSN 6685-00-930-1769
NSN 5950-00-432-6667
NSN 5905-01-050-1827
NSN 4140-00-861-5399
NSN 5950-00-967-9785
NSN 6105-01-537-0830
NSN 5910-01-468-5891
NSN 6105-00-455-8879
NSN 5960-00-860-7709