Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H73R603ABK found under Compressor Unit Refrigeration by Bristol Inc. The National Stock Number assigned to this part is 4130015764337, and the Federal Supply Class is 4130 Refrigeration And Air Conditioning Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H73R603ABK.