Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9643 found under Parts Kit Valve by Dp Mfg Inc. The National Stock Number assigned to this part is 4820013600283, 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 9643.