The RYOBI 12 in. Electric Surface Cleaner with 3 caster wheels is a great time saving accessory to use on hard surfaces like driveways, patios, or sidewalks. This accessory cleans 4X faster than a standard nozzle, with high pressure rotating jets that provide a large, streak-free cleaning path. Easily connect the surface cleaner to your pressure washer with its ¼ in quick connect. The 3 caster wheels make moving between jobs easier than ever before. The RYOBI 12 in Electric Surface Cleaner is compatible with most electric pressure washers up to 3100 psi.