How to use the Three-way Master negative pressure head: First, take out the main frame of the negative pressure drainage. Place it on a flat surface. And install the drainage bucket: Hold the bottle with both hands, hang the negative pressure drainage bottle on the bracket cap, and buckle the button of the fixed bracket. Then connect each drainage barrel, take out the three-way connector and connect it to the three-way interface on the negative pressure drainage outer barrel. (Note: Both ends of the tee must be at the position of the drainage meter.) Then take out the single-head drainage tube and connect the tee and the negative pressure meter. Then take out the negative pressure drainage bag and put it vertically on the four negative pressure drainage outer cylinders in sequence. (Note: When putting the lid on the outer tube, use both hands to press the drainage lid evenly and firmly to tightly combine with the drainage bucket to prevent air leakage.) Then connect the bags with drainage tubes (note the drainage table The two bags on the side do not need to be connected, leave the two interfaces on the bag, use one interface to connect to the tee, and the other interface to connect the drainage tube.) Connect the interface of the negative meter to the negative pressure machine or central negative pressure machine. And adjust the negative pressure gauge to the appropriate pressure. It can work continuously and normally. When the bag is full of liquid, unplug the drainage tube of one connector, and use the other end of the drainage tube connected to the other connector to connect to the other interface that was just unplugged. Hold the drainage bag with both hands, cover both ears and gently lift the bag, take out the bag smoothly and place it in the specified place. Note: The drainage tubes connecting each bag must be inserted correctly and connected according to the flow path of the liquid. The connection between the lid and the barrel should be tight to prevent failure to attract air due to air leakage. The drainage bag with anti-backflow device needs to be placed last in order, and the interface is connected to the tee through the drainage tube. The anti-backflow device must not be exposed to water before use. Single use.