Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RW3 820405 found under Valve Regulating Temperature by David Brown Gear Systems Limited. The National Stock Number assigned to this part is 4820011905897, 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 RW3 820405.