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  • Ridgid Sp-500 Sump Pump Installation

    I just purchased SP-500 Ridgid sump pump to replace my old one. Previously, the existing sump pump manual recommended a vent hole on the discharge pipe just above the pump but below the check valve to prevent any air lock. I did not see anything about this for the new sump pump. In fact the new sump pump manual recommends a reverse check valve directly attached to the pump. What is the reson for this?