Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RD402AY06T PC21 found under Disk Valve by Pall Aeropower Corporation. The National Stock Number assigned to this part is 4820010436787, 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 RD402AY06T PC21.