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I MANUAL Another unique FE Petro feature. When necessary during maintenance to bleed line pressure to zero, a vent screw is provided. By turning this screw, line pressure is diverted back to the tank. PRESSURE RELIEF: �a Reduces fuel discharge into the sump manhole or dispenser pan during "servicing, further protecting service technicians and the environment. A RELIABLE CHECK VALVE: The IST uses FE Petro's proven line check valve. At 2 3/4" in diameter, this valve reduces pressure loss at high flow rates, resulting in faster fueling times and lower power consumption. tThe FE Petro check valve is proven to seal. You can avoid purchasing additional check valves when the IST is used with some electronic line leak detectors because of this proven reliability. SUPERIOR BEARING COOLING: The IST uses the exclusive FE Petro cooling system. This unique system continually passes over 1 GPM through a fine bronze filter and directly through motor bearings whenever pump is operating. This system has beentd igned to extend critical bearing and motor hf .. PRESSURE RELIEF VALVE: The IST pressure relief valve is the same simple valve used for years in our standard submersibles. Factory set to relieve U at or above pump pressure. This valve is protected from particles in the fuel by a fine �. mesh screen. By keeping static line pressure as high as possible, mechanical leak detectors make fewer tests, and therefore last longer. The IST uses the standard FE Petro air eliminator, which has a double function as the syphon primer for tank syphon systems. I AIR ELIMINATOR: The air eliminator is a one way valve, allowing air to return to the tank, but not re-enter the piping system. SYPHON CHECK VALVE: Optional for syphoned tanks. Another time proven performer. O v� 1 The FE Petro syphon check valve can be easily cleaned in the field. It is not necessary to replace with a new valve if it becomes blocked from particles in the fuel tanks.