Highly insulated tube shields incoming ground water from cold as it passes through the frost level. Polyethylene construction ensures years of troublefree use. One 30-inch tube and 3 feet of 12-inch plastic drainage tile provides a sufficient heat well in most locations. For northern locations, two 30-inch heat tubes may be required. This insulated extension tube allows water line to enter from below without freezing. Rubber plug can be removed for access to water shut-off valve. | Miraco Insulated Heat Tube