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 6150-01-167-9104
NSN 6130-01-434-0788
NSN 6135-01-472-9011
NSN 5960-01-169-1372
NSN 5950-00-403-5412
NSN 5975-01-153-1927
NSN 5975-01-464-2867
NSN 5945-00-108-7048
NSN 5999-00-628-1619
NSN 5965-01-623-8583
NSN 6645-01-395-2989
NSN 5835-00-594-4921