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I have a lawn sprinkler system with a 1" feed. When it changes zones we get a 'ca-chung' in the cold water pipes (1/2 to 3/4" depending on location) in the house. I have installed a water hammer arrestor between the water supply (back flow valve) and the zone valves. The arrestor is about 8" tall for a 1/2" pipe. We are still getting the 'ca-chung' when the system changes zones. Should I install a larger arrestor in the same location?

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