SN series indoor fire hydrant conforms to gb3445-2005 national standard, the product is divided into common type, decompression and pressure stabilizing type, rotary type, rotary decompression type. It is a necessary fixed fire protection facility for urban buildings, industrial and mining enterprises and ship docks. Reduced pressure type, rotary type, rotary reduced pressure type fire hydrant is suitable for high-rise buildings or ultra-thin fire hydrant box.