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 5915-00-303-4168
NSN 6320-00-242-3300
NSN 5975-00-330-9400
NSN 6135-00-998-5884
NSN 5965-00-689-1545
NSN 4140-00-458-3327
NSN 5930-00-339-1002
NSN 2925-00-371-2285
NSN 6685-00-918-3282
NSN 6150-00-111-4099
NSN 5835-01-022-6362
NSN 5915-01-285-1465