6 METAL DRAINAGE CHANNELS; METAL BACK WATER VALVES FOR PREVENTING ENTRANCE OF BACK WATER TO THE SEWAGE SYSTEM OF A BUILDING; METAL BACK WATER VALVES FOR RECEIVING BUILDING WASTE AND PUMPING THE SAME TO THE STREET SIDE OF THE SEWAGE SYSTEM; METAL PIPES; METAL PIPES WITH ACCESS OPENING FOR USE WITH BACK WATER VALVES; METAL DRAIN PIPES; METAL PIPES FOR USE WITH ELECTRIC CABLE PIPES; METAL PIPE CONNECTORS; METAL PIPE BENDS; METAL PIPE SOCKETS; METAL PIPE FITTINGS; METAL GRATINGS; METAL GULLIES, NAMELY, BATHROOM, FLOOR, CEILING, BASEMENT, NON-POTABLE WATER, RAIN WATER AND SEWER GULLIES WITH AND WITHOUT STENCH TRAPS AND BACK-WATER VALVES; METAL VENTILATION SHAFTS AND PARTS THEREOF; METAL DRAINING SHAFTS AND PARTS THEREOF; METAL SHAFTS FOR INSTALLATION IN THE EARTH, USED FOR FOOT TRAFFIC, CABLES, UTILITY CABLES AND INSPECTION PURPOSES; METAL STORAGE TANKS SPECIFICALLY FOR WATER, CHEMICALS AND OTHER LIQUIDS; METAL STORAGE TANKS SPECIFICALLY FOR GREASE, STARCH AND HIGH-VISCOSITY LIQUIDS; SYSTEMS FOR UTILIZING RAIN WATER, COMPRISED PRIMARILY OF A RAIN WATER STORAGE TANK, A MECHANICAL WATER PUMP, A WATER FILTERING UNIT FOR INDUSTRIAL USE, ELECTRONIC CONTROLS FOR OPERATING THE PUMP AND WATER MONITORS FOR MONITORING THE WATER LEVEL IN THE STORAGE TANK