In a robotic assembly, a body adapted for mounting on an arm is provided. A connection is adapted to couple the body and an end effector to allow deflection of the end effector with respect to the body between an open position and a closed position. A conduit allows fluid flow between the body and the end effector. A seal is adapted to engage the conduit to provide a fluid seal when the end effector is in the closed position and allow fluid flow when the end effector is in the open position. Further, end effector deflection can be detected based on the fluid flow and utilized to regulate movement of the robotic assembly.