Abstract: A method and apparatus for treating the interior of a pipe having one gap or discontinuity or a plurality thereof is presented. Gaps or discontinuities may be of the form of a joint between two discrete sections of pipe, a redundant fluid passage communicating with the main pipe, a ferrule intrusion (15) such as a service connection or plug connection, or they may form due to deterioration of the pipe over a period of time. A filling material or sealing material (21) is applied to the gap or discontinuity, once the gap or discontinuity has been located, and this may be subsequently sprayed with a lining material (34) to form a continuous lining for the pipe. Means are also provided to exclude air from the region of the gap or discontinuity to be filled, thereby aiding the creation of a substantially smooth surface by the exclusion of air bubbles.