Bowtruster, Engine, Prop, Hull  
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The old and the new vacuum valve for the cooling system.

We have taken out the membrane to prevent it from getting clogged and to prevent water to siphon back into the engine.
Instead of the membrane we have a hose from the top of the "vacuum" valve (it's no longer a vacuum!) to the cockpit drain where water are trickling out when the engine is running, and air is sucked back when the engine shuts off.
Much more robust than the vacuum system.