Patent ID: 8801048

Claim:
A coupling assembly comprising a pipe and a fitting mechanically joined without an adhesive or bonding agent, wherein: the fitting comprises an end portion having an end opening defined by an interior annular surface, the pipe comprises an end having an outer annular surface received within the end opening of the fitting, a seal ring disposed within the end portion of the fitting in sealing contact with the interior annular surface thereof and with the outer annular surface of the pipe end, a locking ring disposed within the end portion of the fitting adjacent the seal ring, and a support disk disposed within the end portion of the fitting adjacent the seal ring and in assembly with the locking ring for supporting the locking ring in a predetermined disposition relative to the outer annular surface of the pipe end and the interior annular surface of the end portion of the fitting, the locking ring including a plurality of corrugations extending circumferentially thereabout, the corrugations presenting inner edge portions engaging the outer annular surface of the pipe end and outer edge portions engaging the interior annular surface of the end portion of the fitting for opposing withdrawal of the pipe end axially outwardly from the fitting.