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 5990-00-144-3243
NSN 6145-00-884-8112
NSN 5960-00-689-5813
NSN 5905-00-902-3628
NSN 2925-01-560-4123
NSN 6645-01-076-4655
NSN 5935-01-630-3759
NSN 5915-00-468-3911
NSN 5990-00-042-3413
NSN 6645-01-384-0628
NSN 5910-01-441-0987
NSN 5910-01-602-1663