Whole vacuum pump body is made of A.B.S. and aluminum alloy. Various precision elements are developed, designed and assembled through long-time test. Each part is tested through strict quality control. Twin diaphragm pump design. Low noise, wear resistance, non-pollution, long life, free maintenance, low power consumption. Condenser starting design with temperature control protective switch. DF-750 is the necessary item of small clinics, pediatrics and home care.