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2. Burial vault (enclosure) - Wikipedia

   en.wikipedia.org/wiki/Burial_vault_(enclosure)

   A burial vault encloses a coffin on all four sides, the top, and the bottom. Modern burial vaults are lowered into the grave, and the coffin lowered into the vault. A lid is then lowered to cover the coffin and seal the vault. Modern burial vaults may be made of concrete, metal, or plastic.

3. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   The covers usually feature "pick holes", into which a hook handle tool is inserted to lift them. Pick holes can be concealed for a more watertight lid, or can allow light to shine through. A manhole pick or hook is typically used to lift them, though other tools can be used as well, including electromagnets. Painted manhole cover in Osaka, Japan

4. Water tank - Wikipedia

   en.wikipedia.org/wiki/Water_tank

   A Hydro-pneumatic tank is typically a horizontal pressurized storage tank. Pressurizing this reservoir of water creates a surge free delivery of stored water into the distribution system. Glass-reinforced plastic (GRP) tanks/vessels are used to store liquids underground. [citation needed]

5. Stuffing box - Wikipedia

   en.wikipedia.org/wiki/Stuffing_box

   The stuffing box prevents water from entering the boat's hull. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull. The "box" is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts.

6. Compartment (ship) - Wikipedia

   en.wikipedia.org/wiki/Compartment_(ship)

   Watertight subdivision limits loss of buoyancy and freeboard in the event of damage, and may protect vital machinery from flooding. Most ships have some pumping capacity to remove accumulated water from the bilges, but a steel ship with no watertight subdivision will sink if water accumulates faster than pumps can remove it.

7. RBMK - Wikipedia

   en.wikipedia.org/wiki/RBMK

   The bottom part of the reactor is enclosed in a watertight compartment. There is a space between the reactor bottom and the floor. The reactor cavity overpressure protection system consists of steam relief assemblies embedded in the floor and leading to Steam Distributor Headers covered with rupture discs and opening into the Steam Distribution ...