Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N1137 found under Flapper Valve Compressor Air by Haldex Brake Products Corporation. The National Stock Number assigned to this part is 4820003532022, 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 N1137.