Abstract: The specification discloses a double sleeve coupler for coupling coaxially juxtaposed plain end steel pipe sections or pipe pile in metal-to-metal leakproof contact and at the same time providing a high strength connection under tension. A number of forms of couplers are disclosed, all essentially having two rigid metallic cylindrical sleeves of different diameter arranged coaxially one within the other with an annular space or socket therebetween at each end into which the wall of the plain end pipe or pipe pile may be driven as by hammering or by a pile driving hammer. The annular space between the sleeves expands radially outwardly in diameter toward the center of the coupler to a larger cylindrical diameter adjacent the center of the coupler. The length of the expanded inner section of the socket exceeds the thickness of the annular space forming the socket.