Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CP-4B found under Knuckle Head Block by United States Department Of Treasury. The National Stock Number assigned to this part is 3442010876522, and the Federal Supply Class is 3442 Hydraulic And Pneumatic Presses Power Driven. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CP-4B.