Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BK183A1371 found under Seat Valve by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 4820000572106, 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 BK183A1371.