A system and method to facilitate device monitoring and servicing is provided. The tubular section are extruded to include dovetail cross sectional areas that can be stacked and a semi-circular locking collar slides into the dovetail guide and locks the tubular sections together. A port selector piston is linearly moveable by hydraulic pressure from a de-energized position within the piston receptacle to an energized position for sealing with a selected flow port and accomplishes development of a spring force during hydraulically energized piston movement.