This Sioux Chief Hydra Rester Water Hammer Arrester with a 1/2\" thread and a maximum pressure of 350 PSI is perfect for those looking to prevent water hammer and extend the lifespan of their plumbing systems. Made in the United States, this unit is of the highest quality and is designed to meet the needs of any industrial or residential plumbing system. The brand is trusted within the industry and this unit is a must-have for anyone looking to maintain the efficiency of their plumbing system.