Data Splitter
3 x Female RJ connectors
Two of these units are required when using the CAF-302 and CAF-306 repeater along with 2 CAF-303 LCD Navigation displays.  If you need one of these you probably also need a CAA-134-1m cable.  See the connection diagram below.  This splitter can also be used to connect 2 303s to a single 302 or 302A - without the 306.

System with 302, 306 and 2 303s 
If you are using 2 of the CAF-303 LCD Navigation Display units along with a CAF-302 and CAF-306 you will also need 2 of these CO-119 adapters and 2 of the CAA-134-1m RJ cables.  The cable that is included with the CAF-306 will be used between the 2 CO-119 units and the 2 CAA-134-1m cables that are included with the CAF-303 units will be used to connect the CAF-303 units to the 2 CO-119 adapters.  The 2 extra CAA-134-1m cables will be used to connect the CAF-302 and CAF-306 to the 2 CO-119 adapters.

System with 302A and 2 303s
Two CAF-303 LCD Navigation Display units can be connected to a single 302A.  You would need a single CO-119 splitter.  Each 303 comes with a CAA-134-1m cable that is 1 m long.  You will probably need a much longer cable to go from the splitter to the remote 303.  3 m should do it.  I can make a 3 m long CAA-134-1m upon request for $30.