The pressure relief valve is installed in the intake pipe on a valve to control the pressure boost. The opening and closing of relief valve is controlled by ECU (electronic control unit). ECU be based on the turbine outlet pressure to determine the level of pressure, once the pressure exceeds the critical value, the solenoid coil be energized or power off control, thereby opening or closing the pressure relief valve. When the pressure relief valve is closed to that the intake pipe has sufficient intake pressure as the basis, when the valve opens to excess gas can be discharged into the atmosphere, reducing the inlet pressure, protect the engine intake pipe. By adjusting the position of the heating sink, the pressure relief sound is produced by different frequency when the pressure relief gas hits the heating sink at high speed. To remove the pipeline from the intake of compressed air compressor after the excess pressure. material. Light weight and durability. This is of Metal + Plastic material. Easy installation, Excellent fitment and Superior Material. Type:Turbo Relief Valve Condition: Fitment Type:Direct Replacement Fitment:For Universal Colour:Blue Material:Metal+Plastic Package Contents: 1 x Turbo Relief Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.