Connect the tail end of the connecting pipe to the ground water supply pipe. Connect the elastic horn sealing sleeve of the quick connector to the water pipe on the bus, hold the handle and rotate the locking tube. The inner shrink tube moves inward relative to the locking tube, and the inner horn of the locking tube compresses the locking section of the inner shrink tube. The longitudinal groove of the locking section is reduced, so that the locking section presses the elastic horn sealing sleeve tightly. The elastic horn sealing sleeve is tightly combined with the water pipe on the bus, thus completing the docking work of the water pipe. When unloading the pipe, rotate the handle in the opposite direction to lock the pipe backwards, restoring the locking section of the inner shrink tube to its natural state, and the elastic horn sealing sleeve to its natural state, making it easy to pull out the quick connector.