The switch at the end of the shower head reduces flow but doesn’t turn the water completely off as a preventative measure to prevent scalding. It will run a little. The on/off elbow that comes with the Road Shower 4, and also sold in our spare parts store, could be used to turn the water on and off completely. The switch is designed as a water saving measure while out camping, so that you can switch the water off while lathering soap or shampoo, then switch it back on for rinsing. This is especially useful if you are inside a shower tent. When the shower is over, turn the water off completely using the black handle on the elbow. Use the black handle to adjust pressure during the shower. Dial it back to save water and to get longer run times.