Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MODEL 1450 50557 found under Tester Pressure Gage by Emerson Electric Co. The National Stock Number assigned to this part is 6685016092047, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MODEL 1450 50557.