FNM HPE Series Owner's Manual page 93

Figure 37 - Sea water filter opening
3. Insert the antifreeze liquid (antifreeze mixture) in the filter and put the engine to minimum rpm
to facilitate the antifreeze additive aspiration in the cooling circuits up to overboard discharge.
In the case of applications with stern drive follow the same operation using the casings on the suction
intakes of the stern drive and sucking from a tank containing the antifreeze mixture.
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FNM HPE Series 89