Sioux Chief 656-E - 12-5/8 " HydraRester Commercial Water Hammer Arrester12 5 8 " HydraRester Commercial Water Hammer Arrester Certified by the American Society of Sanitary Engineering to the ANSI ASSE 1010 2004 Standard Lifetime cycle tested at U. S. Testing Laboratories to withstand 10,000 shock cycles. Factory tested to withstand 500,000 cycles without failure (654 C tested) HydraRester male sweat fittings are compatible with press fitting systems, such as Viega ProPress and all push fitting systems Allows for