A portable device for remotely opening and closing the discharge gate of a bulk seed box. The device is lightweight and easily engages the bulk seed box. The device is cantilevered in place by sliding the mounting base into the receiving portion of the bulk seed box. The mounting base is configured to engage a series of holes in the bulk seed box. A remotely electric actuator operates a pivotally swinging opener arm. The opener arm engages the discharge gate handle, opening the discharge gate when the electric actuator arm is extended.