Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4378A1139 found under Filter Element Wate by Sotera Engineered Solutions Llc. The National Stock Number assigned to this part is 4610016488051, and the Federal Supply Class is 4610 Water Purification Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4378A1139.