Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D8421-4D2P found under Valve Rotary Selector by Republic Mfg Co. The National Stock Number assigned to this part is 4820009174055, 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 D8421-4D2P.