Abstract: A device for obtaining samples of stockpiled granular material comprises an elongated tubular member extending into a silo through the base thereof. The tubular member has an array of first holes along a side thereof. An elongated plate with a plurality of second holes is juxtaposed to the side of the tubular member. A manually operable shifting lever is connected to the plate for shifting the plate longitudinally along the tubular member, alternately to align the second holes with the first holes to enable collection of granular samples from the silo via the tubular member and to misalign the first and second holes to prevent entry of granular material into the tubular member. Where the silo has a lid at the top thereof for covering an opening in the top, an additional manual shifter is operatively connected to the lid and to the tubular member for enabling a manual shifting of the lid relative to the top to alternately open and close the opening.