A tank bottom sampler refers to the sampling equipment installed below a storage tank to collect samples of the stored medium. It includes sampling tubes and their accessories inside the tank, as well as valves and pumps in the external part of the tank. According to the manufacturer of the鹤管(héguǎn), a tank bottom sampler is mainly composed of the main support, auxiliary support, sampling tube, return oil tube, buoy, flexible connector, manual pump, valves, external tank connector, and fixed bracket.