Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D11-20 found under Gasket by Roper Industries Inc Roper Pump. The National Stock Number assigned to this part is 5330004890761, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D11-20.