Due to limited choice of fittings, a combination of special fittings must be made for which pipe type?

• A. DIP
• B. PVC
• C. Steel
• D. ABS

Answer: (A)

When connecting pipe materials, fittings and joint options drive how you assemble a run. Ductile iron pipe (DIP) often has a more limited set of standard adapters and transition pieces, so you can’t rely on a single, universal fitting to make every connection. To get a leak-tight, pressure-rated connection to other materials or to different diameters, you typically need a combination of special fittings—adapters, reducers, and joint connectors that work together. This is why DIP commonly requires multiple specialized components to complete a transition. In contrast, PVC, ABS, and steel generally have larger catalogs of standard fittings and more straightforward transitions, so fewer special pieces are needed.