Valvesonly are premium AWWA Valve Manufacturers in USA. The term “AWWA Valve” refers to a type of valve that adheres to the standards set by the American Water Works Association (AWWA). Description: Material: Cast Iron, Ductile Iron Class: 150 to 300. Nominal Pressure: PN6 to PN25. Size: 1″ to 72″. Ends: Wafer, Lug, Flanged