Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2020BLA found under Light Warning by Whelen Engineering Company Inc. The National Stock Number assigned to this part is 6220013544654, and the Federal Supply Class is 6220 Electric Vehicular Lights And Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2020BLA.