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 6130-01-235-2824
NSN 6610-01-152-2821
NSN 6240-00-025-9203
NSN 5930-01-115-8690
NSN 6135-01-415-1163
NSN 6320-01-064-0372
NSN 5835-00-148-6026
NSN 4140-00-595-0376
NSN 6130-01-222-2180
NSN 5990-01-357-6175
NSN 5975-01-056-4727
NSN 6645-00-079-4087