Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 504 0063 found under Cock Drain by Cummins Power Generation Inc. The National Stock Number assigned to this part is 4820012348340, 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 504 0063.