Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1303-03-C FN 18 found under Valve Ball by Engineered Coil Company. The National Stock Number assigned to this part is 4820015166152, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1303-03-C FN 18.