This product is an integral part of our revolutionary system that permits the installation of services (water, electricity, etc.) to your projects, like marinas. The cover must be used with the service base. It comes in 2 different options. One is with a specially patented hinge that allows it to be fixed on the outskirts of your dock. The second version comes without this hinge and is meant to be installed inside the boundaries of your dock (needs 4 pins to hold it in place)