Entran II is a rubber hose used for radiant in-floor heating systems and snow melting. It was manufactured by Goodyear Tire & Rubber for Heatway Systems from 1989-1994. A plasticizer was added when the tube was manufactured to keep it flexible. This plasticizer, however, began to leach out of the rubber when it was exposed to high temperature heating water. The tube then hardens and cracks, causing complete failure of the heating system. Entran II tubing was installed in approximately 10,000 homes throughout the U.S.