The BMW N47 (2.0L) and N57 (3.0L) diesel engines are equipped with a high pressure Bosch fuel rail just like any other common rail diesel engine, but they use M15 threads where the injection pipes fit the rail rather than the traditional M12 and M14 connectors. This makes isolating individual fuel lines when running injector and rail pressure diagnostics a challenge. This new M15 injection fuel rail blanking & sealing plug set provides the necessary and correctly-sized metal blanking plugs that allow the technician to blank off and seal individual injector circuits when performing pressure diagnostic tests.