Charlotte Pipe and Foundry also offers a complete line of double-hub pipe, designed to help contractors reduce material costs and labor. CI foundry, charlotte, nc Foundry - Charlotte, NC Charlotte Pipe has manufactured plastic piping products for drain, waste and vent (DWV) plumbing systems since 1967. Today we operate more than 1,000,000 sq. ft. of state-of-the-art facilities in North Carolina, Pennsylvania, Texas, Florida, and Alabama. Our Plastics Division has grown to become the largest producer of plastic DWV piping products in the U.S. Today our complete systems are manufactured from PVC, ABS, and CPVC thermoplastics. Applications include pressure and drain, waste, and vent systems.