Abstract: The invention discloses a seed holding hopper or the like, which is mounted in vertical position on a planter vehicle. The hopper is cylindrical, closed at the top by a lid or cover, and closed at the bottom by a bottom member which has the usual seed exit opening through it. A clean-out opening is provided in the cylindrical wall of the hopper close to the bottom and a closure member is mounted on the inside of the hopper, conforming in shape to the cylinder portion of the hopper with guides holding the closure member close to the adjacent wall of the hopper and slidable vertically downward to close the clean-out opening and upwardly to clear the opening so that one may clean out any seed left in the hopper. The closure member, in open position, extends out through the top of the hopper and must be safely in the closed position for the lid or cover of the hopper to be placed in its usual position closing the hopper.