Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 159H1977 found under Valve Flow Control by Kraft Fluid Systems Inc. The National Stock Number assigned to this part is 4820016670777, 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 159H1977.