Abstract: A conduit for use in a geothermal heating and cooling system which includes an elongated tubular member having first and second ends, the member having an outer surface. A longitudinally extending divider wall is disposed within the tubular member. The divider wall divides the interior of the tubular member into first and second fluid flow passageways extending longitudinally within the tubular member. The apparatus further includes a cup shaped member disposed on the second end of the elongated tubular member. The cup shaped member directs all fluid flow in the first fluid flow passageway from the first end to the second end into the second end of the second fluid flow passageway. Other forms of the invention have first and second elongated tubular members that have first and second ends and each of the tubular members has an outer surface.

Abstract: Apparatus for coupling the axial extremities of two associated inner ducts used for housing at least one fiber optic cable. The coupling includes first and second cylindrical sections, each having inner concave faces and outer convex faces and apparatus for engaging the axial extremities of the associated inner ducts. The apparatus for engaging is disposed on the inner face of the cylindrical sections. The apparatus also includes structure for providing mutual gripping between the first and second cylindrical sections. The structure for mutual gripping on the first and second cylindrical sections is disposed on the first and second cylindrical sections and functions only when the first and second cylindrical sections are engaged with at least one axial section of an inner duct.