What type of pipe can PVC use for tees, elbows, and other fittings?

The correct answer pertains to the compatibility of materials used in conjunction with PVC (Polyvinyl Chloride) pipe. PVC is typically joined with fittings that are made of materials that can withstand similar pressures, corrosion resistance, and thermal expansion characteristics.

Ductile iron is often used for fittings alongside PVC because it offers robust strength and durability, which is important in underground and high-pressure applications. Ductile iron fittings can provide a secure and leak-proof connection to PVC pipe systems, making them suitable for a variety of applications, including water supply and sewer systems. The compatibility in handling high stress and environmental conditions allows for effective integration with PVC piping.

Other materials like steel, lead, and brass each have their own issues when paired with PVC. Steel can corrode when exposed to moisture over time unless properly coated. Lead is no longer considered a safe material for water systems due to its toxicity. Brass, while often compatible, is generally not used as frequently with PVC in large-scale or underground applications due to cost and the potential for dezincification, which can weaken the fittings over time. Thus, ductile iron stands out for its reliable performance when paired with PVC fittings like tees and elbows.