Material With Interchangeable Joints All The Four Necks Are Vertical. The Two Side Necks Are 180° Apart And The Third Neck Is At 90° From The Other Two Necks Four Necks, Centre Neck And Three Parallel Side Neck, With Interchangeable Joints Uniform Wall Thickness Distribution And The Round-Bottom Shape Make Them Ideal For Heating The Shape Facilities Uniform Heating Accessories, Thermometer, Column, Dropping Funnels, Boiling Capillaries, Etc. Can Be Fitted Depending Upon The Application Generally Used In Distillation And Extraction Processes