Copper Pipe

• Copper pipe comes in two types: flexible and rigid. Flexible pipe is usually for small-diameter applications, such as ice makers. Rigid pipe is not bendable but rather must be joined with copper adapters to redirect the pipe. Copper pipe is also available in different levels of thickness. Type M pipe is thin, while Type L pipe has a medium wall and Type K is the thickest available. Type L is used for most residential drinking water.
  
  

PVC Pipe

• PVC pipe is commonly used in sewage and drainage systems. But PVC pipe is not acceptable for drinking water due to the chemicals used in the manufacturing process. PVC also cannot carry hot water from water heaters. However, unlike copper pipe, PVC can be buried underground for decades without corroding. It also can carry hazardous waste, such as sewage, without corroding. The hardiness of PVC makes it a great alternative to copper for non drinking-water uses.
  
  

CPVC Pipe

• CPVC, or chlorinated polyvinyl chloride pipe, is safe for drinking water and is an alternative to copper pipe. CPVC pipe can also run hot or cold water, unlike PVC pipe. CPVC pipe is resistant to corrosion and scale buildup, allowing it last for decades without maintenance.
  
  

Galvanized Steel and Black Pipe

• Galvanized steel pipe is useful for ventilation and waste applications but is not suitable for potable drinking water. Galvanized steel is rust resistant, but it will rust over time. Black pipe is simply steel pipe. This is useful for outdoor irrigation such as outdoor showers or sprinkler systems, but not for drinking water because it will rust faster than any other kind of pipe.