POOL MAIN DRAIN UTILITY PUMP is a powerful and durable utility pump that is designed primarily for draining chlorinated and salt water in-ground swimming pools. The slotted “basket” base measures less than 5 1/2-inches in diameter, which allows the pump to fit inside any standard 8” main drain and seat itself several inches below the top surface of the pool’s main drain flange. With a maximum flow rate of 5373 GPH, it can quickly and efficiently remove water from any in-ground Swimming Pool.