Ideal for a variety of plumbing and heating purposes, the 1/2" x 2' Copper Type M Hard Temper Straight Pipe is strong and durable. It not only meets industry standards, but is also NSF and ANSI Standard 61 certified.1/2" x 2'Type MResidential hard copper tubeConstructed of hard-temper ASTM - B88 copperFor general plumbing and heating uses.,Ideal for a variety of plumbing and heating purposes, the 1/2" x 2' Copper Type M Hard Temper