Sioux Chief 20mm Hydra-Rester Size B Water Hammer Arrestor

When a shuttering fixture closes, a pressure wave begins to move back along the pipe. As it reaches the arrester the force acts against the arrestor piston, which, in turn, pushes against a charge of air. The air is then compressed, dissipating the wave energy and nullifying the hammering effects. Water Hammer Arresters do not compensate for loosely fitted pipe work. The HydraRester is formed from Type L copper tube and is cold rolled and spun closed seamless. The piston carries two EPDM seals and is lubricated with approved 111 Silicone Compound. System surge pressure can be kept below 1000kPa while the arrester can operate at a safe working pressure to 2300kPa. The device is easily installed via the versatile BSP male thread and can be fitted in any position 90° to the pipe work.