Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4AC10585 found under Valve Safety Relief by Dresser Industries Inc. The National Stock Number assigned to this part is 4820007354026, 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 4AC10585.