Now you can make your submersible pump draw from even lower in your tank without turning the pump sideways, causing it to draw more from the floor of the tank. There are three openings available, depending on the pump's flow. The 3/4″ opening accommodates 250 gph and 400 gph submersible pumps while the 7/8″ adapter fits our 550 and 800 gph pumps. Finally, the 1″ adapter is suitable for the larger 1000 gph pumps. The Active Aqua Bottom Draw Pump Adapter proves very useful when draining tanks for draining more water, closer to the bottom of the tank.