>> A << Drain Pipe Installation

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Tie the cord that was used during removal to the end of the drain pipe, and wind tape around it so that there is no unevenness.
Pull the cord to pass through the drain pipe.

Fig 1: Pulling Cord To Pass Through Drain Pipe
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Install the grommet, and then position the drain pipe so that it protrudes from the grommet as shown in the illustration.

Fig 2: Installing Grommet
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.