Heavy duty oil free piston pump, silent and stable operating performance. - Roller design, 360 Degree rotation. Silicon tube, resistant to high temperature and durable. - Step-less high voltage. High negative pressure, low flow, in order to protect the patient's laryngeal mucous. The circular negative pressure vacuum meter will display the negative pressure value visually. The patient can adjust the negative pressure value on a sputum-absorption required basis depending on their condition. - Anti overflow technology and large pumping rate. - Silent and stable operating performance. - 2.5L x 2 glass bottles, washable and sterilization available. - Stationary design with universal casters. - Suitable for clinics and operating rooms. - Equipped with convenient to operate pedal switches. - Input Voltage - 220 Volts AC +/- 22 Volts - Input Frequency - 50Hz +/- 1 Hz. - Average power consumption - 120 Volt Amps (Watts) - Maximum negative pressure value - >/= 0.09 MPa - Pumping rate - 20L/minute - Continuous operating time - >/= 30 minutes - Rest time - 30 minutes Jug volume - 2500ml glass bottle x 2. - Sound level -