Abstract: A hood that mounts around an outlet of a catch basin with a cover having a proximal end and distal end; the proximal end being pivotally attached to the hood. The cover pivots between a closed sealed position that substantially prevents water born contaminants from passing through the access opening and an open position that allows access to the access opening. The cover is made from a flexible material to allow the cover to be lifted from the closed sealed position in a substantially vertical path that allows access to the outlet of a catch basin.

Abstract: A system for separating and retaining liquid with different specific gravities and floatables includes a hood made of plastic and mounted to cover an outlet pipe of a basin receiving the liquid. The hood is formed with a housing dividing the basin into an inlet chamber and outlet chamber and preventing supernatant liquids with a lower specific gravity, floatables accumulated on the surface of a liquid with a higher specific gravity and solids accumulated in the basin from being drawn downstream into the outlet pipe. The hood is further provided with a device equalizing air pressure between the inlet and outlet compartments. A flow restrictor is incorporated in one embodiment to regulate the discharge of liquid from the basin.