ATTENTION: MAKE SURE YOUR WORKING PRESSURE WASHER IS HIGHER THAN 1500 PSI. Pressure range: 1500 PSI to 4000 PSI. 2500 PSI or higher will have best result. | 13 inch undercar cleaner for hot and cold water power washer with 4 nozzles and 2 casters. | Easy to clean and avoid crawling under a vehicle. Clean road grime, oil and fuel contaminants under cars, trucks, SUVs, commercial-size vehicles and trailers. | 1/4 inch male plug for quick disconnect. Easy to connect and release. Connect under car washer to pressure washer wand. In order to handle wand easily, can connect it to pivoting coupler, then connect pivoting coupler to wand. | AMZ Tool is professional on Pressure Washer Accessory and always stand behind our products, please free to contact us if any questions.