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 5835-01-411-7050
NSN 6685-00-426-6710
NSN 5920-01-131-0668
NSN 6650-01-333-3646
NSN 5950-01-335-5480
NSN 6650-00-287-5868
NSN 6320-01-607-1491
NSN 6240-00-155-8728
NSN 5998-01-452-1298
NSN 6685-00-186-0190
NSN 5998-01-122-2433
NSN 5920-01-594-2424