Pressure washers from Water Cannon Inc. - MWBE feature a recirculation module that cools the water while the trigger gun is closed. The triplex ceramic plunger pump is designed for both commercial and professional daily use. To protect wear parts, it includes an overheat safety valve that will open and close automatically to allow the recirculating higher-temperature water to be released, allowing cool water to replace it. 800-333-9274; www.watercannon.com.