Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS51504A8-12S found under Elbow Pipe To Tube by Imperial Inc. The National Stock Number assigned to this part is 4730001153773, 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 MS51504A8-12S.