Patent ID: 7404872

Claim:
A method of coupling a first longitudinal section of plain end plastic pipe to a second longitudinal section of plastic pipe, the method comprising the steps of: providing a left half of a generally cylindrical seismic coupler body having an end opening and a primary sealing element located adjacent the end opening; inserting the plain end of the first longitudinal section of pipe into the end opening of the left half of the seismic coupler body, the first longitudinal section of pipe having an exterior and an interior, and wherein the left half of the seismic coupler body includes an internal shoulder; installing a cushioning gasket on the exterior of the first longitudinal section of pipe, longitudinal movement of the cushioning gasket being restrained in one direction by means of the internal shoulder of the seismic coupler; fusing an end ring onto the plain end of the first longitudinal section of pipe whereby an external collar is formed on the exterior of the first pipe end which captures the cushioning gasket between the external shoulder and the internal shoulder of the left half of the seismic coupler body; joining a right half of a seismic coupler body to the left half thereof, the right half being a generally cylindrical body having an internal seal region and an end opening; inserting an end of the second longitudinal section of pipe within the end opening of the right half of the seismic coupler body; and installing a connector between the end of the second longitudinal section of pipe and the right half of the seismic coupler body which restrains longitudinal movement of the second longitudinal section of pipe with respect to the end opening of the coupler body.