Orifice PlateModel: OP-ASS-20Top Cover (Flange): M.S./SS.304/PPBottom Cover: M.S. / SS.304/PP is weld neck typeNuts: ASTM A 194 Gr-2HBolts: ASTM -A-193 Gr.87Gasket o: Acid alkali ProofWork Pressure: 10 BAR Or as per designService: liquid