Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P23N0021-7 found under Seat Valve by Precision Products Co. The National Stock Number assigned to this part is 4820007387003, 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 P23N0021-7.