Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8551-1D2 found under Valve Rotary Selector by Teledyne Technologies Inc. The National Stock Number assigned to this part is 4820001630279, 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 8551-1D2.