Abstract: A pipe connection assembly having a branch pipe extending through an aperture in the side wall of a main, double-walled or ribbed pipe, and an elastomeric, tubular gasket positioned in the aperture of the main pipe and surrounding one end of the branch pipe for sealing between the main pipe and the branch pipe. The main pipe has inner and outer cylindrical walls concentrically connected together by at least one rib member, which forms at least one peripheral channel. The tubular gasket seals the space between the inner and outer walls for preventing fluid flowing through the pipes from leaking into the peripheral channel, or channels, of the main, double-walled pipe. The gasket is provided with an annular flange at one end for ensuring proper positioning of the gasket in the aperture of the main pipe. A pipe clamp can be used to secure the gasket to the branch pipe and to provide additional sealing. Preferably, both the main pipe and the branch pipe are composed of a suitable plastic material such as PVC.