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1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />26 <br />27 <br />28 <br />public potable water supply or any natural source(s) such as a <br />well, spring, river, stream, harbor, etc. or "used waters" or <br />"industrial fluids". These waters may be contaminated or <br />polluted or they may be objectionable and constitute an <br />unacceptable water source over which the water purveyor does <br />not have sanitary control. <br />2.4 Backflow: The reversal of the normal flow of water caused <br />by either back -pressure or backsiphonage. <br />2.5 Backpressure: The flow of water or other liquids, <br />mixtures or substances under pressure into the distribution <br />pipes of a potable water supply system from any source or <br />sources other than the intended source. <br />2.6 Backsiphonage: The flow of water or other liquids, <br />mixtures or substances into the distribution pipes of a <br />potable water supply from any source other than its intended <br />source caused by the reduction of pressure in the potable <br />water supply system. <br />2.7 Backflow Preventer: An assembly or means designed to <br />prevent backflow. <br />2.8 Air -Gap: The unobstructed vertical distance through <br />the free atmosphere between the lowest opening from any <br />pipe or faucet supplying water to a tank, plumbing, fixture, <br />or other device and the flood level rim of said vessel. <br />An approved air -gap shall be at least double the diameter of <br />the supply pipe, measured vertically, above the overflow rim <br />of the vessel; and in no case less than one inch. <br />