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These small devices are extremely important to protect your plumbing system from pressure surges. Originating from appliances like dishwashers, pressure surges can cause severe damage to the plumbing system and can also cause loud banging noises known as “water hammer”. Water Hammer Arrestors are hydro-pneumatic devices that absorb the excess pressure in the pipes, thus preventing noises and damages. Nations WareHouse offers a selection of Water Hammer Arrestors with different sizes and connections.