Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7700-18A-12 found under Valve Exhalation by North Safety Products L L C. The National Stock Number assigned to this part is 4240012503598, 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 7700-18A-12.