Abstract: An improved clip-on pouring spout is removably attachable to a screw neck of a container. The pouring spout has a funnel section with a mated prong pair extending proximally from a larger cross-sectional opening of the funnel. The prong pair together defines essentially an external perimeter of the neck. A lumen surface of the prong pair can have an interiorly extending rib, which provides an essentially tight connection when the prong pair is attached to the neck. The rib can extend from the lumen surface closer to an exterior surface of the funnel section, or closer to an interior surface of the funnel section, or intermediate between the exterior and the interior surfaces of the funnel section. The clip-on pouring spout can have more than one prong pair, e.g., four prong pairs, with each prong pair sized to accommodate the same or differently sized screw necks. The pouring spout with a plurality of prong pairs can have an interiorly extending rib on each prong pair.