Lewmar Ocean 20 Hatch The Lewmar Ocean series hatch features a classic style that is fitted to countless boats around the world. The rugged construction provides a tight seal to keep the elements out. This boat hatch is constructed with an anodized aluminum frame for excellent corrosion resistance in marine environments. Whether for ventilation or to cool off, the hatch friction levers can hold the lid open in any position up to 95. Lewmars Ocean hatch is suitable for CE area 2, including decks,