National Screen Corp.'s intake screens are designed for use in wells, reservoirs and rivers. They also can be used in landfills, fluid treatment systems and dewatering well applications. Available construction-types include PVC, CPVC, HDPE and PP, and pipe sizes range from 1/2 inch to 24 inches in lengths up to 20 feet. Precision machining is said to assure accurate slot sizes, which start at 0.006 inches. National Screen Corp.