Abstract: A pipe coupling for transverse connection of a drainpipe to a concrete sewer pipe of larger relative diameter. The coupling has a hollow, longitudinally extending cylindrical body with first and second ends and interior and exterior surfaces. The body has an external locating shoulder, on the exterior surface, integral with the body and extending outwardly therefrom. The external locating shoulder limits penetration of the coupling in an opening in a sidewall of the concrete pipe. The body also has an internal groove on the interior surface, located at a same longitudinal spacing as the external locating shoulder. The internal groove receives an internal sealing ring for creating a seal between the drainpipe and the body when the drainpipe is inserted.