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the year and gasoline Reid vapor <br />pressure, the VacuRite° System <br />increases inventory between 3/4 <br />to 1 1/2 gallons per 1,000 <br />gallons compared to a station <br />with no vapor recovery. <br />For balanced system retrofits, an <br />inline check valve is used. The <br />suction line to the collection unit <br />is connected to the dispenser side <br />of the check valve and the outlet <br />of the unit is connected to the <br />tank side. This prevents vapors <br />from being drawn from the <br />storage tank when the collection <br />unit is on, but allows liquid from <br />refueling mist to drain back to <br />the storage tanks when the <br />collection unit is off. <br />CFC -1 Vapor Flow Control Valve <br />