Water hammer refers to the phenomenon that occurs in the piping system with abrupt opening and closing of valves. To prevent explosion of the pipes, water hammer arresters are required. Jinmai Technologies possesses the sophisticated technology for the production of water hammer arresters that are in full compliance with PDI WH-201 Standard, producing the most optimal efficiency and endurance. - Stainless Steel Body: Corrosion Resistant - Stainless Steel bellows operated piston: highest efficiency - Standard: PDI WH-201 Standard Certificate secured - Operating Pressure: Safety guaranteed up to 400 P.S.I.G.