Knowledge Points of Fire Fighting Interface 1Appearance: Use a knife to scrape the interface surface lightly. Visually, the surface should be treated by anodic oxidation or electrostatic spraying. 2Drop resistance: 1) The inner buckle type interface grasps the vertical downward position, the lowest point of the interface is 1.5M +0.05 height from the ground, and then falls freely to the surface of the concrete soil.After repeated five times, check whether the interface is broken, and whether the fire interface with the same caliber can operate properly.If the fire-fighting interface breaks after falling or fails to operate normally, the product will be judged unqualified. 2) The card interface and threaded interface are in horizontal state from the axis of the interface.