retail services in relation to pumps, water supply equipment, waste water disposal installations, and water supply instruments

construction, maintenance, installation, and repair services related to pumping, pumping stations, waste water disposal instruments, and sewer systems; installation, maintenance and repair of motors and engines; installation, maintenance and repair of heating installations and air conditioning installations; installation, maintenance and repair of regulating systems, control components and auxiliary components for heating, air conditioning and water treatment systems; assembly and installation heating networks; installation of plants for the treatment or disposal of untreated waste water; and construction of basins, ponds and pits for water collection; services in the field of flood control, pressure drainage, and groundwater lowering; structural and civil engineering for the conveying of sewage and sludge; providing repair information; installation, maintenance and repair of pumps; installation, maintenance and repair of electric installations and equipment, including control and regulating installations; installation, repair and maintenance of data technology installations; plumbing; rebuilding machines that have been worn or partially destroyed; rebuilding engines that have been worn or partially destroyed; pump maintenance and repair services