Non-corrosive synthetic parts and durable O-rings; it has a separate cover and sump for internal and external applications. ABS material, corrosion resistant, UV resistant, high gloss and anti-aging. Quick and easy installation. The screw-out lid allows for quick access or can be secured to the case with a wire cover. Ideal for marine/yacht applications such as deck boards and hatches. If you have any questions about our products, please feel free to contact us. We will try our best to solve any problem for you.