Abstract: A fitting for connection to a metal plain end pipe includes a generally cylindrical sleeve section sized to receive and cradle a pipe end portion, an annular seal in the sleeve section for forming a fluid-tight connection between the pipe end portion and the fitting and a locking rod extensible into the sleeve section. The locking rod is received into a bore extending substantially tangentially through a wall of the sleeve section and communicating with a sleeve section interior surface over less than a cross-sectional circular periphery of the bore whereupon a segment of the wall of the bore forms an intersection with the interior surface along the length of the bore. The locking rod has a metal cutting tip for tangentially cutting a groove along the intersection in a pipe end portion received in the sleeve section. The locking rod is securely retained in the groove as a key for firmly locking the pipe into the fitting.

Abstract: A fitting for connection to a metal plain end pipe includes a generally cylindrical socket section sized to receive and cradle a pipe end portion, an annular seal in the socket section for forming a fluid-tight connection between the pipe end portion and fitting, and a locking device extensible into the socket section for securing the pipe end portion to the fitting. The socket section has a first bore extending from an exterior surface substantially through the socket wall and a coaxial, second bore of lesser diameter than the first bore extending the remainder of the way. The locking device includes a shaft having a head end and an opposite tip end for extension through the first and second bores and inwardly of the socket wall interior surface for engagement with a wall of a pipe end portion positioned in the socket section. A ring seal around the shaft engages a side wall of the first bore for providing a fluid-tight engagement between the shaft and the side wall.