Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DDG 870214-6 ITEM 3 found under Disk Valve by William E Williams Valve Corp. The National Stock Number assigned to this part is 4820013276590, 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 DDG 870214-6 ITEM 3.