The PCWI COIL1370 Circular Pipeline Coil Electrode 54" / 1370mm Diameter # 0206 CPCE-0206 is ideal for verification of porosity or holidays on pipelines or circular surfaces. This PCWI circular Pipeline Coil is suitable for all High Voltage Porosity detectors, holiday detectors, spark testers and jeepers. The coil electrodes are shipped complete with ball bearing ends.