Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 291R004 found under Sleeve Cartridge Hy by Aerocontrolex Group Inc. The National Stock Number assigned to this part is 1650002294081, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 291R004.