Yamaha - Manifold 1 - 6C5-13641-00-00 Wheel Hubs & Lug Nuts It is only needed when

It is only needed when adding vessel sensors beyond the base engine configuration

OEM saves money in the long run because everything simply works the way it should the first time

Any special tools required

Direct Water Flow Path – Transfers cooling water from the lower unit to the engine block

Mercury – NMEA 2000 T-Connector | Network Expansion Tee | 8M0204742

Yamaha - Manifold 1 - 6C5-13641-00-00 Wheel Hubs & Lug Nuts It is only needed when6C5 13641 00 00 MANIFOLD 1 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.