Advantage Evolution ESBBHH19500 Typhoon Big Boy Pond Pump 4 HP 230V 19500GPH. The Evolution ES Big Boy pond & water garden pumps are High performance, High flow, High energy efficiency industrial grade pumps that feature a true 3 inch suction and discharge. These external pond pumps come with quick connect unions. The ES Big Boy achieves phenomenal flow rates and low energy consumption through out the ESBB line of pumps These professional grade self-priming external pumps are specifically engineered to provide years of exceptional performance and reliability with the lowest possible energy consumption with whisper quiet operation. These economical out of water pumps are an ideal choice for use in large ponds, fish hatcheries, and commercial water features. Trusted by experienced pond builders worldwide, the Big Boy Pumps are also an ideal choice for use with larger Filters and other professional pond filtration systems. When you compare actual flow rates and wattage consumption to competitor pumps on the market today, the Big Boys are in a class of their own! Manufactured and assembled in the USA and covered by our exclusive warranty, these durable workhorse energy saving pumps are built to last. Certain models feature custom engineered quality US-made Leeson and Baldor motors. Offering exceptional value, the Big Boys are truly the professional's choice.