Specification Connect type: 4 holes Air Pressure: A) Within the range of usable 3~6kgs, adjusted by the pressure switch on the treatment machine. B) Foot stitch control from the start teeth cleaning and sandblasting machine stops working. Water Pressure: Pressure can be used in more than 0.5kgs. Feature: 1. The use of water, gas, powder removing smoke stains, tartar, color stains, plaque, and wihtout prejudice to the gums. 2. The air filtering device (sandblasting tank) can completely prevent moisture, oil and gas blocks forming powder into the handle or pipe blast. 3. A compact, lightweight body with total gas switch, easy to operate. 4. Drainage gas button (Drain): Before each use, press the button three times to drain gas emi tube separate from water tube, never mixture. 6. Tip can be disassemble and clean. 7. Anti-retraction system.