The hysteresis coupler drives the reel to wind and unwind the hose, which can effectively prevent the hose from being damaged. It is recommended that the reel be installed on the mobile equipment and used when traveling   with the equipment. At the same time, it can be used in combination with variable frequency drive. When the variable frequency parameter setting deviates from the actual coiling, the hysteresis coupler acts as an overload protection element to prevent cable damage.