metal castings for construction and municipal use; iron fittings for ducts; manhole covers of metal; metal castings for construction and municipal use; metal flanges; metal valve boxes; metal service boxes; metal cleanout boxes, metal monument boxes; meter boxes; metal extension rings; metal manhole frames; metal drainage gates; metal curb inlets; metal trench gates; metal detectable warning plates

Metal castings for construction and municipal use; iron duct fittings; [ hubless cast iron soil pipes, ] pipe fittings, and pipe couplings; metal joint restraints for ductile iron pipes