Zero Thrust Style Control Guns are designed primarily for underwater use, where the self-canceling forwards and backwards thrusts allow the operator to carry out blasting operations without being propelled away from the intended work area. Zero Thrust Style Control Guns also have application on dry land, where a balanced tool is needed, such as in a suspended gondola on the side of a building. Features: The quick change rebuild cartridge allows field overhaul in 30 seconds or less For corrosion resistance, all components are of high grade stainless steel, and the complete assembly weights just 16.45 lbs (7.47 kg)