Of the following, which pipe type is still manufactured and used in the US?

• A. PVC Pipe
• B. Ductile Iron Pipe
• C. Cast Iron Pipe
• D. Steel Pipe

Answer: (B)

Ductile iron pipe is still manufactured and widely used for water mains in the United States because it combines high strength with ductility, giving durability under buried, pressurized conditions. Its ductility lets it absorb loads and minor ground movements without cracking, and cement-mortar linings plus protective coatings resist internal and external corrosion for long service life. Flexible jointing options, including mechanical and restrained joints, make it adaptable to different installation situations and seismic considerations. While other materials are used, ductile iron pipe remains a standard, actively produced option for new installations, which is why it’s the correct choice.