plumbing; installation of plumbing; maintenance of plumbing; plumbing services; repair of plumbing; plumbing installation, maintenance and repair; installation of plumbing systems; advisory services relating to the installation of plumbing; plumbing maintenance advisory services; advisory services relating to the maintenance of plumbing; plumbing installation advisory services; plumbing repair advisory services; advisory services relating to the repair of plumbing; repair of water supply apparatus; installation, maintenance and repair of water supply apparatus; installation of water pipes; repair of water supply installations; repair of gas and water installations; installation of pipes; toilet [water-closet] installation and repair; installation and repair of toilets [water-closets]; installation and repair of water closets; water closet installation and repair; maintenance of apparatus for purifying water; maintenance of water purifying apparatus; installation of water supply apparatus; repair of apparatus for purifying water; installation of equipment and apparatus for gas and water supply; repair or maintenance of water purifying apparatus; installation and repair of bathroom heating devices; emergency servicing of water supply apparatus; repair of water purifying apparatus; installation of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; repair of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; installation and repair of heaters for baths; maintenance and repair services of public utilities in buildings; repair or maintenance of gas water heaters; maintenance of bathtubs; repair of energy supply installations and of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; installation of heating, lighting and cooking apparatus; installation of apparatus for heating; services for the washing of buildings; installation of utilities in construction sites; shower installation and repair; installation, maintenance and repair of heating apparatus

training of specialists in the plumbing industry