THE HEART OF YOUR POND SYSTEM: this submersible pump is ideal for moving water in ponds up to 400 gallons. EFFICIENT WATER CIRCULATION: this 420 GPH (gallons per hour) pump's powerful and efficient design keeps the water moving in your water feature. CONTROL THE WATER FLOW: Manually adjust the water flow with the pump's adjustable flow control feature. VERSATILE USE: Ideal for use in ponds, create your own custom water features, or use to power hydroponics systems. Connect to water features using ¾ in. ID tubing (adapter included). ENERGY EFFICIENT, QUIET AND LONG-LASTING PUMP: Built to last, these durable, reliable pumps are designed to save on energy costs while operating quietly, so you enjoy the sights and sounds of your water feature. smartpond stands behind this with a 3-year manufacturer's warranty (2+1 with online registration).