Cable Assembly Extension 2 foot (0.6 meters). This wire is used to connect a 3 port 3 way valve used on the Dr. Oligo for Auto Nozzle Washing to a valve driver board. It is needed because the wire that comes on the valve is not long enough to reach the valve driver board. Some 3 way valves use a 2 foot extension and some need a 4 foot extension depending on their distance from the valve driver board.