I don't know that 4 is better then 3 or why you feel you need 4. As I think about it there is a fill, drain, pump suction. Vent can be provided by fill line or its own line which would be four. The tank they installed (if they did) more then likely bows when filled so all the water can't be drained or sucked into the pump which would explain the chunk of wood to hold the center up when the tank is full. JMHO
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