Filter/Regulator/Gauge, is a compact unit that fits into the LP gas line behind the tank valve to filter out impurities and regulate the bottle pressure to a safe working pressure. The POL Excess Flow Valve will shut down fuel flow to down-stream equipment in the event of a regulator fire or ruptured hose. Hose lengths are from 6 ft (1.82 m) to 25 ft (7.62 m).