Which side should you start with when operating a watertight door?

• A. Hinge Side First, Bottom to Top
• B. Latch Side First, Top to Bottom
• C. Top to Bottom Along the Door
• D. Push from the Outside

Answer: (A)

When closing a watertight door, the right sequence keeps the door square in the frame and ensures a proper seal. Start on the hinge side so the door pivots smoothly and stays aligned as it moves toward the latch side. Then close from bottom to top so the lower gasket seats first and the seal is built up upward, which helps prevent leaks where water pressure and gravity tend to push against the bottom edge. This bottom-first, hinge-first approach reduces binding and ensures the door seals effectively, whereas starting at the latch side or top-to-bottom can cause misalignment or an incomplete seal.