Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 963 82 21 204 found under Cock Poppet Drain by Pilatus Aircraft Ltd. The National Stock Number assigned to this part is 4820016303616, 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 963 82 21 204.