Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DB503-50FT found under Seal Nonmetallic Special Shaped by Johnson Rubber Co The. The National Stock Number assigned to this part is 5330010248381, 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 DB503-50FT.