Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 505173 found under Tube Assembly Fuel by E A Patten Co The. The National Stock Number assigned to this part is 4710002964767, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 505173.