Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12250-M23-509 found under Valve Pressure Regu by Treadwell Corporation. The National Stock Number assigned to this part is 4820007836560, 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 12250-M23-509.