Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M16 19191B found under Valve Regulating Fl by Parker Hannifin Ltd. The National Stock Number assigned to this part is 4820010262738, 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 M16 19191B.