Leon must know how to operate the ice switch and show that he is not confused by the color and shape similarities of the tanks. You also need to fill the gas and water tanks to specifications and certify that they were obtained from the manufacturer. The defect in the product that caused this flame led to an explosion and his injury. The manufacturer can indicate that Leon did not use the machine as specified and that Hank made a mistake in filling the tank that caused the explosion. The product is not defective.