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 5990-01-316-0989
NSN 5895-00-404-9636
NSN 5996-00-245-2581
NSN 5996-00-075-0980
NSN 6685-01-442-4985
NSN 5915-00-553-8755
NSN 7035-01-103-3342
NSN 6620-01-031-8180
NSN 5990-01-286-0601
NSN 5965-01-369-4101
NSN 5855-01-060-8521
NSN 5996-00-035-5624