ATTENTION: Pressure range: 1500 PSI to 4000 PSI. 2500 PSI or higher will have best result. Under car wash make sure your working pressure washer is higher than 1500 PSI before you use it. Dual-Function: Undercarriage cleaner mode avoid crawling under the vehicle. Perfect for cleaning road dirt, oil and fuel contamination under trucks, SUVs, cars, commercial vehicles and trailers. Water broom mode efficient removing loose debris (sand, leaves, light soil) from sidewalks, driveways, decks, etc. It works as pressure washer suface cleaner. Package List: Including 16 inch 2 functions-in-1 Pressure Washer Undercarriage Cleaner, 1-piece 14 inch 90 degree angled wand and 2-pieces 15 inch pressure washer extension wand. All parts have 1/4" Quick Connect. Easy To Switch Mode & Upgraded Design: Pull out the nut of the pivoting coupler at the end of cleaner. Then rotate the pivoting coupler to the end. Finally the nut will lock automatically. 2 upgraded flexible rubber wheels,make it flexible to use. Professional Service: Best value in pressure washer surface cleaner Attachment! Please free to contact us if any questions. The professional team is always ready to serve you.