Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WHR 18 U found under Refrigeration Unit Mechanical by Foster Refrigerator Llc. The National Stock Number assigned to this part is 4110010555459, and the Federal Supply Class is 4110 Refrigeration Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like WHR 18 U.