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 5999-01-160-4206
NSN 5855-01-147-6024
NSN 5925-00-574-4362
NSN 5855-00-921-6589
NSN 5905-01-466-5415
NSN 6130-01-158-9437
NSN 6135-01-299-7252
NSN 5930-01-082-4655
NSN 6650-00-792-8577
NSN 6145-00-388-9084
NSN 5996-01-633-7979
NSN 6610-00-844-4871