Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 73638-13X3PC27 found under Disk Valve by Electric Boat Corporation. The National Stock Number assigned to this part is 4820008605085, 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 73638-13X3PC27.