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 7035-01-200-4751
NSN 6610-01-616-7998
NSN 5925-01-283-4414
NSN 6320-00-731-6134
NSN 6130-01-470-6425
NSN 5960-01-379-3947
NSN 5990-01-651-6364
NSN 6220-01-116-2411
NSN 6650-00-111-3399
NSN 6645-00-816-5337
NSN 5945-00-443-0003
NSN 6110-01-596-7302