Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1E552 found under Valve Poppet Engine by Chicago Pneumatic Tool Co. The National Stock Number assigned to this part is 2815005886129, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1E552.