A rotary evaporator is a device used in Chemical Laboratories for efficient and gentle removal of solvents from samples by evaporation.The motor unit which rotates the evaporation flask containing sample material.A vapour duct which acts as an axis for sample rotation, and a vacuum tight conduit for the vapour being drawn off of the sample.A vacuum system (not integral part of the equipment) to substantially reduce the pressure within the evaporator system.