The PCWI BRUSHEXTERNAL457 External Rolling Pipeline Brushes for Porosity Holiday Detectors, 18" / 457mm ID - 477mm OD - 6 Wheels EPBE-0177 is used for the verification of porosity or holidays on pipelines or circular surfaces. This external Rolling Pipeline Brush is suitable for all High Voltage Porosity detectors, holiday detectors, spark testers and jeepers.
