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Knowing the types of plumbing pipes in your home lets you take steps to prevent leaks, flooding, and potential health hazards. Polybutylene is prone to breakage, but it can be replaced with PEX, as it was here. Image: ilovebutter/Flickr.
Galvanized steel potable water supply and distribution pipes are commonly found with nominal pipe sizes from 3â8 inch (9.5 mm) to 2 inches (51 mm). It is rarely used today for new construction residential plumbing.oday, most plumbing supply pipe is made out of steel, copper, and plastic; most waste (also known as soil) out of steel, copper, plastic, and cast iron. The straight sections of plumbing systems are called pipes or tubes. A pipe is typically formed via casting or welding, whereas a tube is made through extrusion.