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The hole in the pipe is to break an air lock that the pump may develop if the sump ever runs dry or the water level drops below the intake of the pump. Air inside the pump might not be purged out when the water level rises and the pump is called to turn on, causing the pump impeller to 'run dry' inside the pump. The hole allows the air to escape and the pump to prime itself and operate without an air lock condition.

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Q: Does a sump pump need a hole in the pipe above the pump?
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