1, thoracic drainage experts: with the support of top precision plastic manufacturing, create a new era of "no water level suction control", the use of precision plastic air valve instead of water level control method for suction control, has been widely used in developed countries and regions, to solve the problems of the previous generation of products. 2, risk prevention: automatic positive pressure release device automatic high negative pressure release device silicone drainage pipe and anti-kinking design anti-reflux device 3, rehabilitation convenience: lung leakage observation window device, accurate control of gas (no water level). 4, humanization: just add water to get negative pressure channel indication