LG-30 Dry Oil-Free Screw Vacuum Pump LG Series Dry Oil-Free Screw Vacuum Pump, Air/Water Cooling, High Vacuum 1Pa, CE Certified, for Oil & Gas Recovery Key Features Oil-free dry design, clean and environmentally friendly, no wastewater discharge Ultimate vacuum 1 Pa, high pumping speed in high vacuum regions Optional air-cooled or water-cooled cooling methods Flow-through components made of corrosion-resistant materials such as titanium, stainless steel, or nano-ceramics