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 5996-01-337-6190
NSN 6650-01-060-3628
NSN 5990-00-241-3780
NSN 6685-01-113-8005
NSN 6645-01-475-8283
NSN 5965-00-501-7835
NSN 6130-01-507-3204
NSN 6320-01-157-9076
NSN 5945-01-035-3941
NSN 6645-00-998-7820
NSN 5965-01-353-4170
NSN 5915-01-170-4308