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 6145-01-418-4938
NSN 5950-01-293-1182
NSN 5905-01-032-6807
NSN 4140-00-411-2619
NSN 5920-01-541-5030
NSN 6220-00-468-5801
NSN 5999-01-451-4520
NSN 6645-01-578-3404
NSN 7035-00-360-2008
NSN 5950-01-556-1404
NSN 5935-00-852-9611
NSN 5996-00-372-4528