Abstract: An apparatus for automatically stabbing and threading a safety valve into a well pipe to prevent upward flow comprises a tubular canister rotatably mounted on a body that is slidably mounted on an upstanding frame to provide vertical movement of the safety valve and canister. The lower end of the frame is connected to a carriage that slidably moves perpendicular to the well pipe so as to transport the safety valve horizontally into direct longitudinal alignment with the well pipe before vertically lowering the safety valve into engagement with the well pipe. An elevator-type clamp connects the apparatus to the upper end portion of the well pipe prior to either vertical or horizontal movement of the safety valve. A variable drive mechanism is employed to simultaneously rotate and lower the canister, and the valve located therein, toward the pipe. The drive mechanism is adjustable to facilitate threading of the valve into a variety of drill pipe thread designs.