Abstract: A pipe joining device for interconnecting a main pipe to a branch pipe in fluid flow communication comprises a lug pipe, sealing collar and lock nut. The lug pipe is a short, externally threaded pipe having a pair of lugs extending radially from one end thereof. Arches cut in the central portion of the lug pipe extend the undercut stem portion in line with the lugs. A tilting and rocking motion inserts first one lug and then the other into a hole cut in the main pipe, clearance for the tilting movement being provided by the undercut stem and arches. The contoured sealing collar and lock nut are attached to the lug pipe to fasten the device to the main pipe. The branch pipe is externally threaded so it can be threaded into the internal threads of the lug pipe to complete the connection. A caulking, bonding or adhesive agent may be employed to provide a more fluid tight seal of the component parts.