Coupling seal for pipe liners

A lined pipe system which comprises:

• a plurality of pipe sections wherein adjacent pipe sections are joined together by a threaded collar;
• a pipe liner section within each of said plurality of pipe sections;
• a pair of pipe liner ends within each of said plurality of pipe sections, wherein each said pipe liner ends includes a splayed section extending radially outward and abutting an end of each pipe section;
• a coupler having a substantially hollow body with an outer surface, a ridge that extends radially outwardly from the outer surface between opposing ends of the coupler;
• and
• at least one radial barb with a point having a maximum diameter, the at least one radial barb disposed on the outer surface between each opposing open end and the ridge wherein the radial barb extends outwardly from the outer surface and away from the ridge such that there is a space between the outer surface and at least a portion of the radial barb;
• where the outer surface comprises a conical section having a wide end and a narrow end between the two opposing open ends and the radial barb whereby the wide end is disposed about the two opposing open ends and the narrow end terminates inside the hollow section of the space between the radial barb and the outer surface.