Patent ID: 7975726

Claim:
An apparatus for repairing a main pipe line a lateral pipe line connected thereto and in communication therewith to form a pipe joint, the apparatus comprising: a bladder assembly comprising a main bladder tube and a lateral bladder tube; a liner assembly comprising a main liner member and a lateral liner tube of resin absorbent material in communication with one another through a liner juncture; the lateral bladder tube and the lateral liner tube being adapted to extend within the lateral pipe line with the lateral bladder tube being inside the lateral liner tube and the lateral liner tube being between the lateral pipe line and the lateral bladder tube; the main bladder tube and the main liner member being adapted to extend within the main pipe line with the main liner member being between the main pipe line and the main bladder tube; and a gasket surrounding a portion of the lateral liner tube and the main liner member near the liner juncture, the gasket being made of a hydrophilic material that is impermeable and capable of swelling in response to being exposed to a liquid, thereby forming a seal between the liner assembly and main and lateral pipe lines at the pipe joint, wherein the gasket includes a tubular portion having a first end and a second end and a flange portion extending outwardly from one of the first and second ends of the tubular portion.