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IMPORTANT: <br /> Installing the incorrect length OPW 53V or 30MV Ball Float Vent Valve for your <br /> specific application may result in delivery flow restriction at levels exceeding <br /> requirements established by the U.S. EPA. Always consult the appropriate tank charts <br /> and determine the specifics of your tank installation to determine the appropriate length <br /> OPW 53V or 30MV. The illustration and instructions below are intended to serve as a <br /> guide in this determination. <br /> Specifying the Proper Length 53V Series Ball Float <br /> Step 1: <br /> Determine Dimension "X": Consult the tank chart(provided by the tank manufacturer)to <br /> determine the distance that corresponds to 10%of the total tank capacity <br /> Step 2: <br /> Determine Dimension"Y": Measure the dimension from the inside top of the tank to the <br /> top of the 4" threaded tank "bung" fitting. <br /> Step 3: <br /> Add measurements"X" and "Y". Then subtract 1/4" and round up to the nearest length <br /> ball float. <br /> Specifying the Proper Length 30MV Ball Float <br /> Step 1: <br /> Determine Dimension "X": Consult the tank chart(provided by the tank manufacturer)to <br /> determine the distance that corresponds to 308 gallons. <br /> Step 2: <br /> Determine Dimension "Y": Measure the dimension from the inside top of the tank to the <br /> top of the 4"threaded tank "bung" fitting. <br /> Step 3: <br /> Add measurements "X" and "Y". Then subtract 1/4" and round up to the nearest length <br /> ball float. <br /> Diagram <br />