Mud-strippers are established in hydraulic cylinders for the purpose of removal of dirt, moisture and various particles from a rod, thus protecting the hydraulic environment from pollution that otherwise would damage surfaces, consolidations and other components of a hydraulic system.

Mud-strippers can be applied both the unidirectional, and bidirectional action, depending on their application and system of consolidation. Their functions it is accurately differentiated: the mud-stripper of the unidirectional action is developed for protection from external pollution, and the mud-stripper dvunapravlenngo has actions additional function - to optimize sisity consolidations and to delete a residual layer of liquid for avoidance of external leaks.