This handbook contains basic information about the materials, tools, equipment and methods of installing sanitary systems, in addition to instructions for testing them before commissioning and during the operation phase. Addressed to plumbers who install internal sanitary systems. Saiitarian engineering works make up a significant part of the total volume of construction and reconstruction of industrial, public and residential buildings. One of the most important features of these works is that sanitary and technical systems (cold and hot water supply, sewerage, ventilation and gas supply) should ensure sanitary and hygienic conditions of work and life of workers, i.e. contribute to improving the well-being and cultural level of the people.