PLUMBING AND HEATING EQUIPMENT AND SUPPLIES, NAMELY, MANIFOLD AND FITTINGS USED FOR THE DISTRIBUTION OF POTABLE HOT AND COLD WATER TO PLUMBING SYSTEMS, NAMELY, WATER CLOSETS, SINKS, SHOWERS, BATHTUBS, LAVATORIES, HOSE BIBS, WATER HEATERS, BOILERS, AND WATER SOFTENERS