Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M81553 found under Compressor Unit Refrigeration by Rosenbauer International Ag. The National Stock Number assigned to this part is 4130015411258, 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 M81553.