Thank you very much for your reply and indeed not so much space to work.
Anyway, the boat is going to be on the yard from next week so I will let you know my progress 😊
What about a stainless valve instead of bronze knowing that most of the time the valve in not in the water?
Also, I need to change the gasket of the bow thruster tube and read some people had difficulty to remove the tube from the electric motor. Did you already made such maintenance?
A54 – 21
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Just expect a struggle getting the old one off. You may be lucky and get it off more easy then I did. Do not forget to clean the threads with a wire-brush before putting on the new one.