Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D20-04479 found under Piston Linear Actuating Cylinder by Portland Valve Llc. The National Stock Number assigned to this part is 3040011926039, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D20-04479.