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 5990-01-623-0082
NSN 6320-01-232-4664
NSN 5950-01-135-1281
NSN 6610-01-272-2987
NSN 5935-01-006-0240
NSN 6240-00-166-2271
NSN 5910-01-061-1963
NSN 5985-01-361-4410
NSN 6135-01-142-2417
NSN 6220-01-025-8551
NSN 5855-00-610-4052
NSN 5950-00-128-6266