Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ES20-4-CS1 found under Cylinder Assembly Actuating Line by El O Matic Usa Inc. The National Stock Number assigned to this part is 3040013728569, 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 ES20-4-CS1.