Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1057-03AY found under Strainer Sediment by Sfc Valve Corporation. The National Stock Number assigned to this part is 4730012052211, 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 1057-03AY.