Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AT157044 found under Valve Calibrated Flow by Nortrax Great Lakes Inc. The National Stock Number assigned to this part is 4820013961502, 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 AT157044.