The picture above is basically the water/oil ATF cooler that comes stock with some of the older Nissan Sylphy / Teana cars. Basically the ATF flows in a U-shape within the canister and at the same time water flows outside to cool the ATF, water is courtesy of the coolant.
There are 2 types of coolers out in the market, stacked fin coolers and tube coolers (specifically Permacool since this is their trademarked technology)...
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