Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number N3978D found under Valve Brake Pneumatic by Haldex Brake Products Corporation. The National Stock Number assigned to this part is 2530000733478, and the Federal Supply Class is 2530 Vehicular Brake Steering Axle Wheel And Track Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like N3978D.