What are the different types of water hammer arrestors?

There are two main types of water hammer suppressors, those equipped with pistons and those that are not equipped with pistons. Among the various means for damping the pressure peak of water hammer, varieties equipped with a piston are the most effective. Homes over 25 years old are the most likely candidates for water hammer, as the only method used to control water pressure when these homes were built was to install vertical pipe risers along horizontal pipe runs at 24 intervals. Over a long period of time, these risers can fill with water, creating an ideal breeding ground for bacteria that can end up contaminating your home's drinking water.

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