Simple and easy manual little volume drainage device

The utility model discloses a simple and easy manual little volume drainage device, including air exhaust device and water pipe, the water pipe is formed by connecting " U " type pipe and straight tube, the mouth of pipe of the one end of " U " type pipe is connected with the mouth of pipe of the one end of straight tube, the orificial horizontal position of " U " type pipe other end is higher than the orificial horizontal position of the straight tube other end, be equipped with on the straight tube and observe the hole, observe the sealed observation window that is provided with of hole department, still be equipped with the connector on the straight tube, be equipped with air exhaust device on the connector, the mouth of pipe department of straight tube can dismantle and be equipped with the closing cock. Through the air emptying of air exhaust device in with the water pipe, form depressurized environment, through siphon principle, then to open the closing cock, water can lead to pipe discharges, uses in a