The employee 2 people are pour the chemicals (Kerosene) from the tank 200 liters into a gallon 10 liters. By the first employee open pneumatic valve for push pneumatic into the tank to flow out through a tube and close the pneumatic valve When the chemicals (Kerosene) full gallon. The second employee add chemicals put gallon 10 liters. After the chemical full gallon the employee need to fold the hose to stop the flow of chemicals that persist in the hose. While the employee folding rubber tube slip out of the hand employee .Cause the chemicals(Kerosene) that still exist in the rubber hose bounce off into the eyes and body of employee