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What would be the purpose of installing a vacuum breaker on a steam main in addition to air eliminators? I had 2 Gorton No. 1 air eliminators and a vacuum breaker at the end of my main. The vacuum breaker was occasionally spitting water and my plumber replaced it with a 3rd Gorton No. 1. I get some loud hammering in the morning at the end of my cycle. Strangely I get the most violent sound around 10 minutes after the cycle ends and the boiler is not running. It only makes noise in the front of the building. I have checked the pitch on all of the radiators on that line and replaced the air valves. It sounds like the steam riser makes the noise but unfortunately the riser is buries inside the walls and is not visible. Would a vacuum breaker help in this situation?