The Dust Collector Vacuum Gun is a blow & suction gun when connecting with wet/dry vac and air compressor. A reversal “Tornado-like” air flow breaks down stubborn dirt, then the vacuum sucks at the same time. The Dust Collector Vacuum Gun significantly reduces air dust particle flows during operation and increases vacuum efficiency & power up to 50%. The optimum air pressure operates between 85 and 95 psi.