Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number J4809B found under Hose Preformed by Energy Services Group. The National Stock Number assigned to this part is 4720009139742, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like J4809B.