Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 97569-04 found under Reference Standard Nephelometry Emulsion by Werfen Usa Llc. The National Stock Number assigned to this part is 6550012983838, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 97569-04.