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 5920-01-003-2906
NSN 6135-00-798-1425
NSN 5910-00-943-2574
NSN 6130-01-559-1062
NSN 5855-01-616-0096
NSN 6145-01-476-2604
NSN 5999-00-031-3961
NSN 5965-00-162-1244
NSN 5930-00-811-5507
NSN 5920-00-224-1634
NSN 5985-01-450-5998
NSN 6610-01-605-1161