Manufacturing and sales of water pumps, vacuum pumps, valves, environmental protection equipment, dredging machinery, high and low voltage complete switchgear and control equipment, marine equipment, marine auxiliary machinery, pump boats, and electric motors; design, manufacturing, and installation of mobile pump stations, floating dock pump stations, prefabricated pump stations, cable-stayed pump stations, and gate pumps; installation of mechanical and electrical equipment; design and construction of wastewater treatment plants; construction of water diversion projects; construction of rivers, lakes, seas, and seawater treatment; production and sales of hydraulic metal structural products; sales of municipal engineering vehicles and water engineering vehicles; operation of export business of self-produced products and technologies, and import business of machinery, equipment, parts, raw materials, and technologies required by the enterprise, except for goods and technologies restricted or prohibited by the state.