Gardner Denver “THUNDER” Water Jettting Piston Pumps. Available in Quintuplex & Triplex. The ultimate evolution of pump performance. With 2,550 brake horsepower, our Triplex pump is a workhorse and a powerhouse, saving you time and money by delivering unparalleled performance at unprecedented operating efficiencies. The Quintuplex pushes this even further to 3000 brake horsepower. The Gardner Denver Thunder Water Jet range can provide flow rates up to 402 m3/hr and discahrge pressures up to 1379 bar.