Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S500X350 found under Reducer Hose by Burke Industries. The National Stock Number assigned to this part is 4730016455480, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S500X350.