4 inches Liquid Controls (LC) positive displacement flow meter for LPG GAS. Four-inch flow meters are used in high-flow industrial applications where large quantities of liquid need to be measured. The flow rates is in the range of 120 to 1200 L/min (approx. 31.7 to 317 GPM), often used for petroleum products like diesel fuel oil. It has a high accuracy and repeatability over a wide range of flow rates.