The Foam core pipe SN-4 can be termed as the multi-layer pipes possessing outer and inner layers of conventional UPVC (Unplasticised Polyvinyl Chloride) while the middle layer is made up of high density foamed PVC. The outer and inner layers are so designed that it can take up the load and the middle layer of the foamed PVC provides rigidity while maintaining the shape of the pipe under load. This way, it reduces the total weight of the Foam core pipe SN-4 by 25% and makes it light when compared to the solid wall PVC pipes. Having terracotta colour, the Foam core pipe SN-4 is most suitable for residential and commercial drain, waste and vent piping systems for both underground and above the ground applications.