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 6620-01-323-1287
NSN 7035-01-354-4318
NSN 5996-00-631-8553
NSN 5905-01-036-6627
NSN 6220-00-134-5334
NSN 6130-00-692-2916
NSN 6645-01-576-9896
NSN 6110-00-542-2202
NSN 5999-00-012-3071
NSN 6610-01-243-8506
NSN 6105-01-120-7916
NSN 7035-01-271-1643