Material: 6063-T6 aluminum alloy color: black Product description: when the engine turbine action, the internal will produce extremely high pressure. Although the turbine itself has the aperture to release high-pressure gas, it is still somewhat insufficient in the face of continuous pressurization. Therefore, the pressure relief valve must be used to enable the high-pressure gas to be released quickly to facilitate the next pressurization. This can not only protect the turbine, but also eliminate part of the phenomenon of turbine hysteresis. Specification :25mm interface