Following the Cessna vent, I cut a whole just below the leading edge in the inboard section of each wing. I made the adaptor out of scrap aluminium and 50mm plastic pipe fittings. These have been bonded together with epoxy, micro balloons and fibreglass. I added a fillet inside so any water that entered would not pool and would just run back out. I have also added a fine aluminium screen to keep bugs out.