Abstract: A pre-fabricated spring box, preferably of stainless steel, has a stepped top, with a closed top back portion, and an open top front portion, which front portion is covered and sealed by a snug hinged lid. The box is preferably constructed of medium gauge brushed stainless steel. The bottom of the box has an opening that is slightly smaller than the bottom. There is an identically sized opening in the back of the box near the bottom. A stainless steel panel of the size required to cover one of these openings is provided. The front of the box has three threaded couplers welded in place for a bottom drain line, an outlet supply line and an overflow line.