Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 91-0057 found under Elbow Hose by Crane Company. The National Stock Number assigned to this part is 4730014995342, 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 91-0057.