Fire hydrant, all copper fire hydrant used to control fire water supply, and hose, water gun connection to form an indoor fire extinguishing system, it in addition to the common ordinary indoor hydrant with all the functions, but also with the water outlet at will rotation and pressure reduction and pressure regulation functions. The free rotation brings convenience to the installation, through the decompression and pressure regulation, the pressure after the plug is maintained stable, ensuring the safety and reliability of use, and can make the fire protection system design, calculation simplification and system simplicity.