Valvesonly are premium AWWA Valve Manufacturers in USA. These valves are constructed using materials that comply with AWWA standards, play a critical role in regulating the flow of water, preventing backflow. Description: Material: Cast Iron, Ductile Iron Class: 150 to 300. Nominal Pressure: PN6 to PN25. Size: 1″ to 72″. Ends: Wafer, Lug, Flanged