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 5925-01-379-7484
NSN 6135-01-576-9616
NSN 5920-01-012-4823
NSN 6645-01-496-7144
NSN 5905-01-204-7207
NSN 5985-00-690-9663
NSN 5985-01-570-8830
NSN 5965-00-119-6207
NSN 5935-01-139-4403
NSN 6650-01-597-7802
NSN 5975-01-607-1883
NSN 6610-00-191-5317