Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RCV31-15X18 found under Ventilator Air Circulating by Air System Components Inc. The National Stock Number assigned to this part is 2040015678339, and the Federal Supply Class is 2040 Marine Hardware And Hull Items. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RCV31-15X18.