... III)With Transparent Water TankPower(W)180180370180180Power supply(V/Hz)220/50 220/50220/50220/50220/ ... back view:The pump is the circulating water vacuum pump, according to the characteristics of small ... meters four taps, double the same use of vacuum pumps, even with teachers' visual presentation, students ... independently or in parallel combination, with four vacuum gauge.3 Master the use of PTFE core ...