A water drain for insertion into a mating wall opening in an extruded, hollow door or window sash or frame comprises a round, rectangular or the like housing having at least one peripheral front flange defining a drain opening, a baffle extending downwardly from a housing top portion for partially closing an upper portion of the drain opening, and a flap having a lower planar rear surface and an upper planar front surface for opening and closing lower and upper portions of the drain opening. The planar lower rear surface portion of the flap is joined to the upper front surface portion by a pivot axis, the planar lower surface being disposed forwardly of the upper planar front surface whereby the flap tends to gravitate to an at-rest, closed, substantially vertical position.