Rotary Evaporator Dome CoverThese plexiglass water bath covers are specifically designed for BVV rotary evaporators and will fit NEO and ECO models. This cover is placed on top of the roto bath and fits securely into place and ensures better temperature uniformity. It also allows condensation steam to vent from the hole on the top so you can clearly see into the bath. Specifications 20L 50L Material Clear Polycarbonate OD 19" 23" ID 16" 20" Height 10" 12" Front Hole 5" Wide x 6"