This little $5 device has endless uses. It's great for "sweeping" driveways and patios and cleaning out your outdoor drains. The ones at the bottom of your stairs often don't have their own trap, because the water in the trap would freeze. A horizontal portion of pipe usually runs to an indoor drain with a trap. So to clear the horizontal pipe simply put this on the end of your hose and shoot it down the drain! Can save many a basement from flooding!