Speciality valve is the leading single orifice air release valve manufacturer in India is a type of valve used in pipelines, especially in water and wastewater systems, to remove trapped air from the system. Description: Available materials: CF8M, CF8, SS316, CF8M, WCB, WC6, WCC, LCB, LCC, SS304, SS316 Class:150-300 Pressure: PN6 to PN40 Size:1/2”-8” End: flanged, threaded visit on - https://www.specialityvalve.com/product-category/single-orifice-air-valve/