1.Top ring material 304/316L/Stainless ... nameTop ringspecifications:1.0× φ196-φ164-25 Product materials1.Steel alloy:carbon steel/ galvanized sheet/304/316L2. ... not listed above. Process technologyCasting, Machining, Metalworking, Sheet Metal Bending, Surface Treatment, Heat Treatment, Griding, Milling ... . Our company produces various kinds of venturi, Top cage, the bottom, the split ring and related ...