Pipe groove rolling machine (often called a groover or roll groover) is a mechanical tool used to cold-form a precise, continuous groove near the end of a metal pipe. This groove is essential for use with grooved mechanical couplings and fittings (like Victaulic, Gruvlok, etc.).
The process is called cold-forming because it shapes the metal without using heat, instead using immense radial force to roll the pipe wall inward, creating a strong, work-hardened groove.