Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WAV 870 ITEM A291 found under Core Assembly Fluid Heater Indus by Senner Karl Inc. The National Stock Number assigned to this part is 4420013258247, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like WAV 870 ITEM A291.