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 5920-00-792-5581
NSN 6685-00-907-6800
NSN 6645-01-478-2140
NSN 6610-01-261-6102
NSN 5915-01-232-6058
NSN 6220-01-013-8445
NSN 2925-01-424-0235
NSN 4140-00-843-1300
NSN 5998-01-077-0132
NSN 6220-00-057-8451
NSN 5960-00-017-2892
NSN 5950-01-605-2823