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You need to drain all the seawater, but the type of drainage must be adapted to the way in which the engine is installed and any additional equipment that is connected, for example sea water filter, vacuum valve, silencer and etc.
The description of Volvo Penta Seawater System Part Exploded View Diagram can be seen as follows:
1. Seawater Cock
2. Seawater Filter
3. the Cover
4. the Drain Cock
5. the Arrows
6. the Drain Plug
7. the Silencer
8. Vacuum Valve
9. Air Cooler
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