The three most common types of copper pipe used in residential and commercial construction are Type K, Type L, and Type M. A fourth type, used for drain-waste-vent, or DWV, piping, is found most often in some older homes. Below, we'll discuss how to choose the right copper pipe for your application.
| Type | Fitting Methods | Flexible form available | Common Use |
| Type K | •Soldered •Compression •Push-fit •Press-connect •Flare (flexible pipe) | Yes | Main water lines, underground lines |
| Type L | •Soldered •Compression •Push-fit •Press-connect •Flare (flexible pipe) | Yes | Branch water supply lines |
| Type M | •Soldered •Compression •Push-fit •Press-connect | No | Branch water supply lines |
| DWV | Soldered, Slip-joint | No | DWV plumbing |
