Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DD-1633 4IN FRP found under Valve Plug by Cunico Corporation. The National Stock Number assigned to this part is 4820012582699, 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 DD-1633 4IN FRP.