The RCS-P is equipped with a plunger cylinder featuring a piston rod on each side of the piston surface. This enables two equal active areas for retraction and extension. The volume of incoming and outgoing hydraulic oil is identical and the grab moves at the same speed in both directions. Oil is guided within the cylinder, so no additional hydraulic hoses are required under the DWP15 slewing gear. This prevents possible damage to the hydraulic hoses and ensures absolute synchronous running without additional mechanical synchronizing guides.