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 5855-01-452-8512
NSN 7035-00-043-1325
NSN 6150-00-369-0376
NSN 5999-01-395-6055
NSN 6685-01-409-2577
NSN 6135-00-793-1809
NSN 5895-01-135-3900
NSN 6685-00-870-2760
NSN 5965-00-402-1749
NSN 6610-01-076-2437
NSN 2925-00-008-5485
NSN 5910-01-094-3655