Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S27780 found under Demineralizer Water by Sargent Welch Scientific Co. The National Stock Number assigned to this part is 4610007302991, 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 S27780.