Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 991742-1 found under Valve Regulating Fluid Pressure by Raytheon Company. The National Stock Number assigned to this part is 4820001651603, 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 991742-1.