A coupling assembly includes first and second pipes, each having a threaded portion and a non-threaded portion. The non-threaded portion of each of the pipes is located at a free end of each of the pipes. The coupling assembly also includes a coupling member for fixedly connecting the first and second pipes. The coupling member includes a first inlet for receiving the first pipe, a second inlet for receiving the second pipe and a non-threaded portion extending between the first and second inlets. A cross-section of an annular recess of the non-threaded portion includes a vertical leg, a firstangled leg extending from the vertical leg, a horizontal leg extending from the first angled leg, a second angled leg extending from the horizontal leg and a third angled leg extending from the second angled leg to the first threaded inlet.