Watertight Hatch/ Weathertight Hatch / Gastight Hatch / Oiltight Hatch Cover 1. Used as emergency escape hatches 2. Weathertight access hatches 3. Door must be watertight from the outside 4. Supplement for spring or beam bay shall be specified 5. Used as inspection hatches or sounding hatces on cargo oil tankse: normal; font-weight: normal">option.