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 6645-01-093-5015
NSN 6150-01-083-9425
NSN 5930-01-529-5162
NSN 5855-01-191-3404
NSN 5905-00-262-5529
NSN 6145-00-411-7948
NSN 6610-01-168-3573
NSN 6650-01-517-9452
NSN 5999-00-678-7190
NSN 5920-00-263-2192
NSN 5855-00-885-8452
NSN 5920-01-158-4517