A Basin Adapter manufactured from High Impact Polystyrene (HIPS). The Basin Adapter may be attached to the 9″ Square Catch Basin, 12″ Square Catch Basin, 18″ Square Catch Basin, 9″ Low Profile Basin and 12″ Low Profile Basin to connect to 3″ & 4″ Sewer & Drain Pipe (ASTM D2729), 3″ & 4″ Corrugated Pipe and 3″ & 4″ Triple Wall Pipe. The Basin Adapter is easily installed or removed by rotating clockwise or counter-clockwise respectively.