Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11R20 found under Lamp Incandescent by Compaq Federal Llc. The National Stock Number assigned to this part is 6240000677526, and the Federal Supply Class is 6240 Electric Lamps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11R20.