Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DYLZ3990-2 found under Valve Assembly Environmental Con by Ge Aviation Systems Llc. The National Stock Number assigned to this part is 1660008323076, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like DYLZ3990-2.