For testing the return flow pressure from common rail injectors of Bosch, VDO/Siemens and Delphi engine systems Suitable for testing the condition of a Piezo pass or fail statement Kit includes two pressure gauges. Gauge 1 (1-3 Bar) suitable for testing Delphi injectors and Gauge 2 (1-15 Bar) for testing Bosch and VDO Siemen injectors Also includes connecting lines, transparent body, return flow connectors, injector connectors, drain valve and tube and quick coupling User manual included