The low cost, easily handled and fitted, light weight, flexible and corrosion-free plastic pipe has greatly reduced the use of galvanised iron. Cement pipes are usually of large bore and used in irrigation and mains water supplies. Fittings are normally cast iron and expensive. Pipes come in short lengths and are heavy, especially if over 150 mm bore. These pipes can withstand high pressures, are fireproof and relatively crush resistant.
Weight is the main disadvantage.
Copper pipes are largely used in fire services and domestic water supplies where small sizes and long life are advantages. The lack of corrosion is important but sinks and baths may be stained. Plumbing with copper is not always easy and expertise in welding is often required. Cost may also be significant. Steel and cast iron pipes are used for mains water supplies especially where large pipes are required as these can sometimes be fabricated on the spot.