Triplex design offers high efficiency and low pulsation. Durable high pressure seals are lubricated and cooled by pumped liquid. Pre-set Lo-Pressure Seals provide secondary protection against external leaks and require no packing adjustment.. Special high density, polished, concentric plungers provide a true wear surface and extended seal life. Optional STHT, FPM and EPDM elastomers for compatibility with many liquids and temperatures up to 200°F. Wet-end easily serviced without entering crankcase.