Stainless Steel Bladder Pumps can lift from depths of 500 ft (150 m) below grade, and PVC models from 100 ft (30 m). Samples can be obtained from greater depths using a drop tube assembly. This places the screened filter intake of the pump as deep as necessary to access the sample zone required. Easily installed without tools on existing pumps, even in the field. Pumps are operated in the same manner, maintaining sample integrity.