The utility model involves an injection from two or more sources of liquid or other fluid injection devices, especially those related to an automatic sprayer. It includes Sheng drug barrels with well-fitting, sprinkler pipes, connecting pipes Sheng drug barrels and spray hose, liquid flow control valves, made gas barrels, made gas barrels can be set in the drug barrels Tong Bi Sheng or outside Tongbi Within hair gas cylinder and the cylinder barrels covered by the composition of the cylinder under the hood also has sponge filter layer, cylinder cover with a vent, a vent under the filter layer with sponge, located around the cylinder cover pressure ring pad, Sheng drug barrels with air intakes at the same time, out of stomatal pores and into the connection between the hose in a vent and the hose connections or hose into the holes and the junctions with gas control valveé—¨. The utility model has a reasonable design, simple structure, low cost, the use of labor-saving and safe.