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 6135-01-574-6577
NSN 6320-01-359-3921
NSN 5915-00-815-7419
NSN 6130-01-354-9928
NSN 5950-00-218-1362
NSN 6610-01-500-8108
NSN 5895-00-576-4865
NSN 6620-01-423-7300
NSN 5920-01-648-2686
NSN 6620-00-009-0904
NSN 5895-00-576-8453
NSN 5905-01-650-0029