This is a critical safety of flight item
A circular, single or multipiece, rigid, metallic or nonmetallic item having a centrally located hole with a sharp edge on the inside periphery. It is supplied in various cross-sectional shapes and is designed to be installed in a cylinder, shock strut, or similar device to remove excess oil, dirt, ice, and/or foreign material from a piston, ram, or sliding rod. Excludes packing, preformed; ring, piston; and seal ring, metal.
Classification: Parts of linear acting hydraulic power engines and motors
NSN 5985-01-485-3062
NSN 4140-01-357-1922
NSN 5835-01-384-3206
NSN 5965-00-368-8204
NSN 5895-01-568-7262
NSN 2925-00-984-7525
NSN 6105-01-020-2946
NSN 5905-01-504-4797
NSN 6645-01-230-8025
NSN 5960-00-947-5754
NSN 5998-00-180-8262
NSN 7035-01-172-4024