Abstract: A grating for a catch basin is disclosed. The grating is formed as a hollow monolithic body from plastic, having a top bearing plate, a peripheral rim, a peripheral bearing shoulder extending inwardly from the rim forming an internal recess, a peripheral downwardly extending skirt, a peripheral base extending inwardly from the skirt, and a peripheral inner wall extending upwardly from the base to the top plate. The top bearing plate has a plurality of slits formed by spaced apart hollow bars. An integral hollow rib in the form of a cross beam extends beneath the top plate. A metal reinforcing plate may be positioned in the cross beam.

Abstract: A catch basin for below-grade installations to receive water through a grate, and which can be adapted to receive and discharge water through a plurality of inlet ports, and be able to withstand heavy bearing loads without collapse of the basin or of its grate, especially one manufacturable by rotational molding.

Abstract: A drain valve according to this invention comprises a mount, a peripheral flange, and a plate-like valve closure hinged to the mount. The valve closure includes a diverter which directs flow in a direction away from the hinged edge when the valve is open. The valve closure also has two latch arms to limit the amount it can open.