【High-quality materials】: The pressure regulator pressure control valve is made of plastic, aluminum, iron, nickel-plated iron, which is strong and stable, strong and durable, and is not easy to damage 【Use instructions】: The 4-hole air compressor pressure regulators are screwed directly onto the compressor or bathtub interface, easy to install and dismantle. The air pressure can be adjusted through the valve knob. With the barometer, you can set the data and read what it can help with saving energy 【Delivery area】: 1 x pressure regulating valve (4-way valve), with air regulator and pressure gauge, the air pressure can be adjusted as needed, while using can maintain sufficient pressure constant 【Wide use】: This 4-hole pneumatic pressure reducing valve has a wide range of applications. It fits most air compressors in Europe