Interpump 59 Pump Series. Pressure Washer Pumps Hollow Shaft for Engines. Flow 13 to 20 Lpm. Pressure 250 to 275 Bar. Speed 3400 Rpm. Nickel Plated Brass manifolds. Interpump Group, the world’s largest manufacturer of plunger pumps, after having revolutionized the high pressure market with a unique product, universally acknowledged for the high technological level, introduces the new generation of pumps E3 “Evolution 3”. Designed by Interpump Engineering Research Center and manufactured entirely in Italy with sophisticated automation processes, E3 represents the best synthesis of Interpump’s long experience. The usual high quality standards are paired with numerous, significant technical innovations, which make the product even more performing and reliable. Interpump Group: “The Big Evolution after the Big Revolution”.