Soux Chief 653-B Hydra ester Water Hammer Arrester for Piping Systems 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) Hydra-Rester male sweat fittings are compatible with press-fitting systems, such as viega process and all push-fitting systems Allows for installation in 2  4 wall cavity Certified by the American society of sanitary engineering to the ANSI/asset 1010-2004 standard