D

[ Pipes, ] formed fittings, namely, [ valves for pipes, and ] pipe joints, all made of ductile cast iron, particularly for use in pressure pipe lines and for use as drain pipes and conduits

[ Casting of metal, metal treating ]

[ Scientific and technological services, namely, scientific research, scientific analysis, and testing in the field of cast iron pipe technology; research services in the field of cast iron pipe technology; quality control for others ]