Include PVC pipes and fittings systems for achievement of draining networks inside buildings. In addition, other special accessories for interior sewage are provided, as well as fastening systemsfor the interior sewage pipes. The system is used to transport rainwater and sewage inside buildings and it is composed of pipes made of PVC with jack and gasket, or smooth jack, ranging in size between 32 and 160 mm, and a complete range of PVC fittings.