Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MAF-855 found under Filter Respirator Air Filtering by Rhine Airinc. The National Stock Number assigned to this part is 4240012680569, and the Federal Supply Class is 4240 Safety And Rescue Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MAF-855.