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 5945-00-185-4815
NSN 4140-01-213-2910
NSN 5965-00-275-0491
NSN 5965-00-356-3838
NSN 5998-01-020-8986
NSN 6685-00-765-4661
NSN 5925-00-684-6468
NSN 6645-01-103-8449
NSN 5950-00-763-5509
NSN 6135-00-134-6648
NSN 6320-01-301-4699
NSN 5996-01-245-8209