How to use the negative pressure head of Tee Master first, take out the negative pressure drainage main frame. Put it on a flat ground. And install the drainage barrel: hold the bottle with both hands, hang the negative pressure drainage bottle body on the bracket cover, and buckle the button of the fixing frame. Then connect each drainage barrel, take out the tee and connect it to the tee on the negative pressure drainage outer cylinder in turn. (Note: both ends of the tee must be at the position of the drainage meter. Then take out the single-ended drainage tube to connect the tee and the negative pressure gauge. Then the negative pressure drainage bags are taken out and vertically sleeved on the four negative pressure drainage outer cylinders in turn. (Note: When covering the cover on the outer cylinder, press the drain cover evenly and forcefully with both hands to make it closely combined with the drain bucket to prevent air leakage. Then connect the bag with the drainage tube (note that the two bags next to the drainage meter need not be connected, and two interfaces are left on the bag, one of which is connected to the tee and the other is connected to the drainage tube. ) Connect the interface of negative pressure meter to negative pressure machine or central negative pressure machine. And adjust the negative pressure gauge to the appropriate pressure. Can work continuously and normally. When the bag is full of liquid, pull out the drainage tube of one connector, and the other end of the drainage tube connected with the other connector is connected with the other connector just pulled out. Hold the drainage bag with both hands, cover both ears, gently lift the drainage bag, take it out smoothly and put it in the designated position. Note: the drainage tube connecting each bag must be inserted into the floor correctly and connected according to the flow path of liquid. The connection between the lid and the bucket should be dense to prevent it from being sucked due to air leakage. Drainage bags with backflow prevention devices should be placed at the end in sequence, and the interface is connected with the tee through the drainage tube. The backflow preventer must not touch water before use. Disposable use.