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 in Dia, which allows the pump to fit inside any standard 8 in 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.