OTO Rotary Vane Vacuum Pumps are designed to handle solvent and corrosive vapors found in chemical and pharmaceutical vacuum applications such as distillation and vacuum drying. Although the pumps do use oil on a once thru basis, which must be disposed of, oil usage is very low. The corrosive vapor handling capability is one of its primary features, as this is accomplished with standard pump materials but the accessories for pump protection must be in corrosion resistant materials.