Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PD278B-22.5 found under Regulator Flow by Automotive Parts Co. The National Stock Number assigned to this part is 3930000038665, and the Federal Supply Class is 3930 Warehouse Trucks And Tractors Self-Propelled. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PD278B-22.5.