Expansion compensator with multiple layers with differing stiffness

An expansion compensator having a longitudinal axis and comprising:

• a) an elongate metal conduit having first and second spaced apart ends, an inner surface, an outer surface, a thickness, and an expansion/contraction section;
• and
• b) an inner plastic liner positioned interior of the elongate metal conduit and having first and second spaced apart ends, an inner surface, an outer surface, a thickness, an expansion/contraction section, and an interior volume extending from the first end to the second end;
• wherein the first and second spaced apart ends of the elongate metal conduit and the inner plastic liner are secured together,
• and wherein each of the elongate metal conduit and the inner plastic liner have a stiffness along the longitudinal axis, and the stiffness of the elongate metal conduit is greater than the stiffness of the inner plastic liner and
• wherein the first spaced apart ends of the elongate metal conduit and the inner plastic liner are secured together by a first connector, the first connector comprising a first arm that is secured to the first end of the inner plastic liner, a second arm that is secured to the first end of the elongate metal conduit and an end portion that is connected to each of the first and second arms and;
• and the second spaced apart ends of the elongate metal conduit and the inner plastic liner are secured together by a second connector, the second connector comprising a first arm that is secured to the first end of the inner plastic liner, a second arm that is secured to the first end of the elongate metal conduit and an end portion that is connected to each of the first and second arms.