Cerro 1/2"x20' Copper Type M Hard Temper Straight Pipe. It is used for a variety of plumbing and heating purposes. It meets industry standards and is NSF and ANSI Standard 61 certified. It has a maximum flow rate of 3.2 gal/min, a maximum working temperature of 400 °F, and a maximum working pressure of 850 psi. It comes with a 1-year warranty.