4″ x 3″ PVC Sewer Reducing Coupling PVC sewer system (Pipe and fittings) is designed for the collection of domestic waste and storm water under the concrete slab of a building; Connection of subsoil drainage pipe around the foundation of the building to a sanitary drainage system; A building sewer and building storm sewer to the municipal sewer lateral at the property line and also used in septic fields. Standards CSA B182.1 ASTM D3034 NQ 3624-130/050 Technical Information PVC Sewer Specifications
