Plastic slotted well screens from Johnson Well Equipment Inc., constructed out of PVC, are designed for use in wells 11⁄4 inches or larger where sand can be held open or the casing pulled back. Slot sizes range from number 8 to number 120, with the numbers designating widths of opening in thousandths of an inch, and custom slotting is available. Pipe sizes range from 11⁄4 inches to 12 inches and in pipe standards of SDR, Schedule 40 and Schedule 80; special lengths from one foot to 20 feet may be obtained. The screens are cleaned, deburred and packaged before shipment. Johnson Well Equipment Inc.
