Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20013A found under Heat Exchanger Air To Water Airc by Niagara Thermal Products Llc. The National Stock Number assigned to this part is 1660005832638, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20013A.