Furuno Rudder Reference f/Outboards On Navpilot 500 & 511 Autopilots [FAPAR4502]The FAPAR4502 is a Rudder Reference Unit for the NavPilot 500 OB and NavPilot 511 OB series autopilot. The FAPAR4502 has an 8" maximum cylinder stroke. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov. This product may not be returned to the original point of purchase. Please contact the manufacturer