A flange alignment tool is provided for aligning misaligned flanges such that one worker can align the flanges, in a safe and efficient manner, with no sledge hammer involved. The flow-regulating device includes a first pressure-measuring device that is connected to one end of the orifice member, and a second pressure-measuring device that is connected to the other end of the orifice member, and a flow-regulating valve that is connected to the downstream side of the differential-pressure flow meter, which includes the above-mentioned units. When the rod and set screw are provided in the housing, the set screw applies a force on the rod and the rod engages the plurality of clamps, causing the clamps to frictionally engage a head of the pedicle screw between the clamps.