Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1257-8742A20 found under Tank Liquid Storage by Brunswick Corporation. The National Stock Number assigned to this part is 5430015351446, and the Federal Supply Class is 5430 Storage Tanks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1257-8742A20.