Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E7999903C found under Boot Dust And Moisture Seal by Rolls Royce Marine Electrical. The National Stock Number assigned to this part is 5930008621084, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E7999903C.