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 5935-01-430-2481
NSN 6110-01-186-0579
NSN 6110-01-239-1786
NSN 5998-00-211-7430
NSN 6650-01-642-0166
NSN 5965-01-222-2613
NSN 6135-01-286-9563
NSN 5999-00-521-1151
NSN 5915-01-042-0144
NSN 6150-00-442-1425
NSN 4140-01-575-5693
NSN 5895-00-859-6600