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 5998-01-224-8144
NSN 5915-00-130-6562
NSN 6645-01-319-8203
NSN 6645-01-352-5675
NSN 6620-00-632-3631
NSN 6240-01-043-5308
NSN 5999-00-190-9995
NSN 5855-01-023-3727
NSN 6240-01-164-5019
NSN 6620-00-391-7858
NSN 6220-01-139-7340
NSN 6685-01-419-6255