REG2XLP: Single Stage Dual Inlet LP Propane Regulator Manual Change Over Valve w/ Dual 20" Copper Lines - One Tank Ices Up, Flip The Switch to Tranfer to 2nd Tank Instantly; Ideal Fire Pits, Gas Heaters; EasyFirePits.com Dual Tank Regulator with Manual Change Over Valve and two 20" Copper Lines with POL Valves Operate the Tanks Individually of Each Other - Just Flip a Switch When Changing Over Tanks when Empty - One Tank Ices Up, No Problem, Go to the 2nd! The Manual Change Over Also Can Regulate Flow!! Use the Manual Regulator to Control Flow By Throttling It Down or Up for More/ Less Gas Flow/ Heat Intensity. Ideal for Multiple Tank Hookup When you Know You're Going to Need that 2nd Tank. Can Switch without Stopping Fire!