... ",1/2"and 5/8";stainless or carbon steel Type: 1.Standard model:single-stage compressor circuit2.Level control mode :multi-effect ... compressor circuit3.Row control mode:double-stage compressor circuit4.Cross ... :four stage compressor circuit Bay numbers:2,3,4,5,6,8,10,12... Finned tubes:Sine wave (corrugated form),crumple ...