Diamond Hydraulic Presses come in two sizes made to fit different size bowls. The standard press only uses a 1 1/2 Qt bowl which holds about 5oz of juice per press. The large press will use either a 1 1/2 or a 2qt bowl. The 2 Qt. bowl which holds about 12oz of juice per press comes with the larger press. The larger is best suited for Champion style juicer which doesn't separate out juice as you grind it. The Omega juicers will work nicely with the smaller bowl. For a 1 1/2 qt bowl in the large press deduct $10.00 from the cost of the large press. The smaller bowl is the only size which will fit with the standard press. If it does not state large in its description it is a standard press. Since each press is unique wood selection may effect the price of the press.