We offer duplex flanges as per the following specifications:Standard: ASTM / ASME A/SA 182 Grade: F 44, F 45, F51, F 53, F 55, F 60, F 61Types:Reducing flangesBlind flangesPlate flangesScrewed flangesWeld neck flangesStainless steel flangesSlip on flangesSocket weld flangesLap joint flanges