The Sandpiper 3″ HDB3 and 4″ HDB4 Evolution Heavy-Duty Ball Pumps are top performers for transferring thin, highly viscous, and solids-laden fluids. These pumps boast the highest maximum flow rates in the AODD pump industry, reaching up to 300 gpm. They offer excellent suction lift capabilities and are engineered to endure the toughest ball valve pumping applications. All Sandpiper heavy-duty ball pumps are ATEX-certified, ensuring safety in hazardous environments. The HDB3 and HDB4 models come with both top- and down-ported options, optimizing performance by addressing issues like solids and abrasives settling in the ball check area. Designed for durability, they significantly outlast standard pumps.