Which pipe type is associated with requiring special fittings due to limited options?

• A. DIP
• B. PVC
• C. Steel
• D. ABS

Answer: (A)

The main idea is that some pipe materials have a restricted set of compatible end configurations and joining methods, so you must use fittings specifically designed for that material. Ductile iron pipe typically uses a limited family of joints (like mechanical or push-on joints) and requires adapters that are made to mate with those ends. Because of those specific interfaces, connections to other materials or different end types often rely on specialized fittings designed for ductile iron. In contrast, plastics like PVC or ABS and steel generally have a wider range of readily available fittings and transitions, so they aren’t described as having limited options. So the pipe type tied to needing special fittings due to limited options is ductile iron pipe.