¡El BERTOLINI Piston Pump es de alta calidad! 1 Forged brass head providing great mechanical strength. ¡El 8 bolts that lock the head onto the crankcase, are designed to endure higher pressure and even overpressures, ultimately reducing the risk from any unloader malfunctions. 2 Unique design of valve caps with recessed O-rings. ¡El thread doesn’t come in contact with water under pressure, therefore eliminating the risk of head failure. Also eliminated the risk of valve caps loosening, even without the use of Loctite®. Torque wrench settings are reduced. 3 Rapid action, mirror finish stainless steel AISI 316 check valves prevent corrosion and enhance high fluid dynamic efficiency, easy access for maintenance and repairs. 4 New plunger rod to reduce the negative areas, therefore to increase the pump volumetric efficiency. Tungsten carbide coated to ensure maximum resistance to wear. 5 Exclusive double “U” self-lubricating packing seals in elastomer, designed to prevent water from contaminating the oil in the crankcase. This gives you years of leak-free operation. 6 Oversized special bronze alloy connecting rods (one piece unit) for maximum strength and easier lubrication. 7 Premium oversized bearings for extended life even under extreme working conditions. 8 Die-cast aluminium crankcase with an increased number of cooling fins on the housing.