• It is applicable to suck thick liquid such as pus-blood and phlegm under negative pressure;
• Oil-free piston pump helps to keep from oil mist pollution;
• Plastic panel makes it resistant from water erosion;
• Overflow valve helps to prevent liquid from flowing into pump;
• Negative pressure is adjustable according to requirements;
• Small volume and light weight, easy to carry, especially suitable for emergency and doctors going their rounds outsides.