IPEX Ultra-Rib® is a gravity flow PVC sewer pipe with concentric reinforcing ribs that encircle the pipe to provide superior ring stiffness and performance. It is an extruded, seamless pipe made from high grade PVC compound. Ultra-Rib is available in standard sewer sizes from 200mm to 600 mm (8″ – 24″). Its optimized profile design offers strength and reliability, as well as economy and superior flow rates.