Seller notes

804533 For Mercury OptiMax Marine Regulator &Tracker Diaphragm This product is Aftermarket Mercury Part #: 804533 804533:The tracker diaphragm is identified by a short knob at the top of the part. The tracker diaphragm that is installed in the starboard fuel rail on either the 2.5L (135 - 175 HP) or 3.0L (200-300 HP) Optimax Engines. We recommend if you do not have a Mercury Dealer doing the job that you purchase the Mercury Air/ Fuel Regulator Installation Tool (Mercury Part #: 91-889431). SHIP...

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