Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 09-140 found under Valve Regulating System Pressure by U S Air Tool Co Inc. The National Stock Number assigned to this part is 4820015469119, 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 09-140.