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 6220-00-248-4483
NSN 5915-01-056-5141
NSN 5998-01-014-5864
NSN 6110-00-636-1234
NSN 5975-00-347-9710
NSN 6645-01-010-3746
NSN 6645-01-356-8252
NSN 6620-00-905-6590
NSN 5905-01-503-8447
NSN 5930-01-020-7715
NSN 5910-01-646-8050
NSN 6685-00-987-3696