Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MFA1-1 found under Valve Regulating Fluid Pressure by Wa Kates Company The. 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 MFA1-1.