environmental protection-oil free vacuum pump, dry clean vacuum for dry scroll vacuum pump ... . industrial and R&D labs ect. ADVANTAGES:environmental protection , no-oil and no-water , non-pollution , get dry clean vacuumlonger maintenance ... using.compact, easy installation and moving, air-cooled,no water,low voice and librationoil free vacuum pumpTECHNOLOGY SPECIFICATIONS: Type Pumping speed Ultimate ...