Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DU4S1 found under Hook Underground Cable Rack by Cooper Power Systems Inc. The National Stock Number assigned to this part is 5975011098592, and the Federal Supply Class is 5975 Electrical Hardware And Supplies. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like DU4S1.