You could call it easy going, because Cerro goes with the flow. Cerro Flow Products supplies copper tubing and other flow products to the plumbing, heating, air-conditioning, and refrigeration industries. Its products include plumbing and refrigeration tubing; level wound coil for use in boilers, chillers, and space heaters; and grooved tube used in evaporators and condensers. The company has a half-dozen manufacturing and distribution centers located throughout the US and is a part of The Marmon Group, an international conglomerate of industrial manufacturing companies owned by Warren Buffett's Berkshire Hathaway.