Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 503-0543 found under Hose by G And M Power Plant Ltd. The National Stock Number assigned to this part is 4720011515024, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 503-0543.