Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 581118 found under Seal Butterfly by Aerocontrolex Group Inc. The National Stock Number assigned to this part is 1560008427376, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 581118.