The main function of the leather cage valve is to control the fire water supply, and to form an indoor fire extinguishing system after connecting with the hose and the water gun. In addition to all the functions of the common SN indoor hydrant, it also has the function of rotating the water outlet and reducing pressure and regulating pressure. The free rotation feature brings convenience to the installation, while the pressure reduction and pressure regulation function ensures that the pressure after the starting plug remains stable, thus ensuring the safety and reliability of use.