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 6610-01-033-7957
NSN 5925-01-442-3792
NSN 6150-00-854-2607
NSN 6685-01-604-4054
NSN 5965-00-088-1722
NSN 5945-01-410-7341
NSN 5945-00-421-5870
NSN 6240-00-553-8891
NSN 5935-01-262-4472
NSN 5935-01-617-9474
NSN 6610-00-291-9093
NSN 5965-01-512-1985