Trimble EZ-Steer adapter cable.  Adapts older EZ-Steer's (CFX-750, FMX) to the new generation NAV-500 or NAV-900 receivers. 
 
Does not work with EZ-Guide 250 or 500 cabling, if you own one of these and want to upgrade to the new generation display/receivers please contact us and we will evaluate what you will need.