... a stem vent can release the internal pressure die casting aluminum 8sets Verified Information This information is Verified by ... Previous Year) Aluminum Cookware, Pressure Cookware Aluminum Cookware 540,000 Pieces / Month, Pressure Cookware 18,000 Pieces / Month Aluminum Cookware 5,400,000 ... NANLONG02 3 4.0 Acceptable Production Flow: 1.Pressure Casting 2.CNC Machine 3.Polishing 4.Stamping 5.Impeller ...