Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ETC8D57 found under Filter Assy Air Con by Alion Science And Technology. The National Stock Number assigned to this part is 4130015149973, 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 ETC8D57.