The PCWI COIL1270 Circular Pipeline Coil Electrode 50" / 1270mm Diameter # 0204 CPCE-0204 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.