James McCue installed a PortVisor™ over the porthole in the T cockpit of his Hunter 28.5. Water from the seat used to run off the seat (and the seat drip channel) onto the porthole. [13-R]
"Now I can leave the aft quarterberth port open and not let water running off the cockpit seat wash into the quarterberth cabin. And I am able to let light in - compared to the solid white visors I've seen."