| Cooling water
The cooling water circulates through two small (2" diameter) tube bundle type coolers on either side of the engine. I believe they are for the engine/transmission oil.
There is also a larger heat exchange for the water/glycol engine coolant.
The water also cools the dripless seals.
It is drawn out of the lake from under the hull and exits out the exaust tube.
I have only has the boat since last summer and just noticed this yesterday while warming up the engines.
John
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