Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1810-2509 found under Flow Relgulator by Industrial Scientific Corporation. The National Stock Number assigned to this part is 4820014733463, 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 1810-2509.