Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R06121NNK found under Valve Regulating Fluid Pressure by Norgren C A Co. The National Stock Number assigned to this part is 4820011074721, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R06121NNK.