Abstract: A gutter section of plastics material comprising front and rear walls and a bottom, the front and rear walls carrying fastening elements for being removably secured to complementary fastening elements of a hanger bracket and a raised bead or projection on the inner surface of the rear wall extending in the same direction as the top of the rear wall and spaced therefrom whereby when a hanger bracket is secured to the gutter section, a hanger bracket engages the bead or projection on the rear wall of the gutter to rigidify the structure and permit ease of expansion and contraction of the gutter section relative to any hanger brackets supporting the gutter section.