Along the cabin roof mushroom vents are installed over the saloon, galley, bathroom and back cabin. These are heavy GU style vents and although made of brass they have been painted not polished. This will look more realistic, take less looking after and importantly be less attractive to the light fingered.
As usual each of the four vents is drilled slightly differently so they were each marked for location and alingnment during fitting. As with the portholes they were drilled and tapped 5/16W and fixed temporarily with steel screws as shown before removal. Eventually, after sprayfoaming and painting etc they will be re installed.
In the photo below the vent dome has been removed to allow fitting.
When installed the inverted dome is operated from inside the boat using the brass handle.