Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10963 53 found under Cock Drain by Siemens Energy And Automation Inc. The National Stock Number assigned to this part is 4820013570166, 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 10963 53.