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 6110-01-324-3311
NSN 6145-01-643-5783
NSN 5998-00-691-6070
NSN 5920-00-579-2286
NSN 6105-00-969-2663
NSN 6110-01-633-9660
NSN 5930-01-606-1128
NSN 6110-00-066-2331
NSN 6240-01-094-6262
NSN 5998-01-462-1871
NSN 6610-01-157-0426
NSN 6645-00-551-8291