Hafken 29 mm thru hull

thingiverse

I've got a few Harken 29 mm Thru Hull Blocks on my sailboat, and they're mounted on some vertical surfaces, which isn't typical. I decided to reduce the amount of rainwater flowing in through these holes, so I replaced the existing face plate with one that has a slight rain gutter at the top - just big enough to direct water that hits the hull above the block. It's not a waterproof solution, but my perspective is that a bilge pump should never work harder than it needs to, so keeping out this little bit of water is worth the extra effort.