The Model 1500 15 Bar Pressure Plate Extractor is used to analyze the water-holding characteristics of soil samples throughout the pressure range of interest in most agricultural applications. The pressure vessel is 4" (10 cm) deep and has an inside diameter of 12" (30 cm). Up to 4 ceramic plates can be accomodated at one time, allowing approximately 36 2-1/4" samples to be analyzed simultaneously. The Pressure Plate Extractor consists of a pressure vessel and lid, clamping bolts, O-ring seals, and outflow tube assemblies.