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 5920-01-381-2597
NSN 5945-01-185-1994
NSN 6135-00-816-9052
NSN 6240-01-651-0489
NSN 5925-01-138-4930
NSN 5925-00-115-8114
NSN 6645-00-845-1071
NSN 5835-00-568-2956
NSN 5960-00-499-6781
NSN 5835-00-904-6272
NSN 5910-01-142-3373
NSN 7035-01-388-6943