Available as a complete new system or as an add-on accessory. The H2O may be added on to an existing PrepStart. No electric or water connections are used. Water can be added to the removable tank. Adding a cone of water mist surrounding the air/abrasive stream captures almost all of the dust. Cutting results continue to be optimal. Use of warm water further enhances patient comfort. Water mist starts and stops instantly with air/abrasive flow. 1-year warranty.