Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H5321436-A1 found under Cock Poppet Drain by Elsag Bailey Inc. The National Stock Number assigned to this part is 4820012008561, 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 H5321436-A1.