Pressure Washer Gas Fired X4 Portable - Discover the LP fired hot power washer, where power, performance, and mobility help you get the job done. The Alkota X4 series is the most popular hot water pressure washer in the industry, guaranteed to provide results you will love. This belt driven pressure washer features a triplex pump that runs at a lower RPM for a cooler, quieter operation. You will love the four wheel design, and it will travel easily over any surface.