ZH Power Craft professional pressure washers combine industrial Engines with high quality Cat direct drive triplex pumps. Professional pressure washers are designed by Northern Engineers to meet the demands of the professional and rental markets. Chosen by 86% of self-service car washes (the most demanding industrial application). Field proven 3-4 times longer seal life. The least expensive pump to maintain. The Cat 3SP pump features a brass manifold and ceramic plungers.