The Inspection Hatch with Detachable Cover is made of tough UV-resistant PP (polypropylene) for extra resistance to the sun, water, salt and detergents containing acetone. It has no hinges, so that you can completely remove the cover. Its opening is easy, since the specially designed thread automatically ejects the cover, once you turn it 90° counter clockwise. Furthermore, it features non-skid surface and hidden screws for smarter appearance.