Certa-Lok^® PVC Well Casing utilizes Westlake Pipe & Fittings field-proven spline-locking design to form a full-strength joint instantly in all weather conditions. No matter the heat, cold, moisture, humidity, snow, or wind, there is no effect on assembly or disassembly. Once assembled, the Certa-Lok CLIC joint can immediately withstand the full safe tensile load.