Superior SWR Drainage System For Leak Proof Joints Astral DrainMaster is a uPVC conventional drainage system for soil, waste and rain water. This system enables fast and efficient removal of waste without blockage and leakage. Its high impact strength, chemical and corrosion resistance. Long life and virtually zero maintenance have made. Astral DrainMaster system is a preferred drainage and rain water system among architects, builders and plumbing contractors. The state of the art equipments and virgin raw materials are used to produce Astral DrainMaster SWR system.