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Sioux Chief 660 Series piston-type water hammer arresters shall be required in piping systems. Water hammer arresters shall be AA size to control water hammer caused by quick closing valves on residential fixtures. Arresters shall be effective when installed at any angle. Arresters shall be approved for installation with no access panel required. Water hammer arresters shall be ANSI/ASSE 1010 2004 certified. Arresters shall be sized and placed per manufacturer's instructions.