Concrete dowel placement system and method of making the same

A method of constructing a concrete dowel placement system, the method comprising the steps of:

• extruding a polymer to form a first tubular element having an outer diameter, an inner sleeve and a plurality of splines extending radially outward from the inner sleeve and longitudinally along the inner sleeve;
• extruding a polymer to form a second tubular element, the second tubular element having an outer diameter different from the outer diameter of the first tubular element, and an inner sleeve and a plurality of splines extending radially outward from the inner sleeve and longitudinally along the inner sleeve;
• attaching an end portion of the second tubular element to an end portion of the first tubular element in a co-axial orientation to form a coupler;
• and
• extruding a polymer to form an elongated, tubular, dowel-receiving sheath, the sheath having at least one interior opening extending along an entire length of the sheath and the sheath being configured to be slidably extensible over the coupler to frictionally engage one of the first tubular element and the second tubular element.