The Sailing Academy on Instagram: "Ever wondered how many layers are between you and the ocean? It’s not so easy to find the specifications on hull thickness for every boat model. A thru-hull fitting creates a controlled, watertight opening in a boats hull for essential functions aboard, yet requires regular inspection for safety as they are critical failure points. While working on some installations, we got a little piece of hull that indicated just how thick the boats in our fleet were. Funny