Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NN20-3PC78-299T0304-631 found under Pulley Idler Assemb by Alfa Laval Inc. The National Stock Number assigned to this part is 3020003693605, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NN20-3PC78-299T0304-631.