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Codman-Hakim programmable valve from the top view (A) and the side view (B) provided by the manufacturer. Side view illustration of the valve mechanism with the valve seat (C) valve ball (D) flat spring (E) spring calibrating fulcrum (F) O-ring (G) titanium base plate (H) pressure control cam (I) x-ray cam position indicator (J) and stepper motor (K) indicated. *Adopted from Manufacturer Website.
