OUTDOOR FIRE HYDRANT Outdoor fire hydrant is the water supplier which is connected to the pipeline network of fire system set outside the building.It aims to supply water for fire engines from municipal water supply network or outdoor water supply network.It can also be directly commected to stream nozzle for putting out fire. The hydrant can be categorized as SS-type and SA-type.The SS-type upper ground fire hydrant has abvious part that higher than ground and can be installed at places where have higher temperatures.It is convenience.The SA-type hydrants are installed undergound and would't affect the appearance of the city.This type is more suitable for cold regions.