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This condenser has a large opening at the top for use with dry ice/acetone or liquid nitrogen. There is an outer standard taper joint set at a 75° angle to the condenser body and a lower inner drip tip joint, both being the same size. The dimensions listed in the product selection menu are the inner depth and diameter of the coolant well. This product is available in several sizes with 19/22, 24/40 or 29/42 joints.