Galvanized Steel Pipe and Cast Iron
The Spruce / Kevin Norris
Two additional types of pipe are sometimes found in older homes and are infrequently installed, especially by DIYers: galvanized steel and cast iron pipe.
Galvanized steel is rigid, corrosion-resistant steel piping that was used for decades for drainage, water supply, gas supply, and several other purposes. While galvanized steel pipe is still around (particularly for gas supply), it is far less common and not used for water supply in new construction or remodel projects. While it has good durability, it's also pricey to install. Each end of the pipe is threaded, and individual pipes are screwed into each other with connecting fittings.
Cast iron is rigid, dark gray piping that was often used for sewer and other drainage purposes. It is still found in many homes and is used today in some commercial and high-rise building applications. Cast iron is expensive but durable with good longevity. It's viable until the point that it rusts completely through. It's also very heavy and difficult to cut. Retrofits tend to replace cast iron pipes with rigid plastic pipes, such as ABS.
Use for: Use galvanized steel pipe for water supply lines, drain, and vent lines. For most homeowners, galvanized pipe will mainly be found in the form of gas supply lines. Though once commonly used for sinks, showers, tubs, and other fixtures, galvanized pipe still can be used in this manner, if local plumbing codes permit.
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