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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.
Cast Iron Soil Pipe and Fittings used in the United States are classified into two major typesâhub and spigot and hubless. Hubless pipe and fittings are also referred to in the plumbing industry as no-hub. Hubless cast iron soil pipe and fittings are manufactured without a hub, in compliance with CISPI 301.