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2. Butterworth cover - Wikipedia

   en.wikipedia.org/wiki/Butterworth_Cover

   Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.

3. 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.

4. Pin Index Safety System - Wikipedia

   en.wikipedia.org/wiki/Pin_Index_Safety_System

   The pin index safety system uses a face seal between the cylinder valve and the associated yoke clamp. There are two holes in specific positions on the cylinder valve body below the outlet port , in positions associated with the gas mixture, which prevent connection of the cylinder to a yoke or pressure regulator with a mis-matched set of pins.

5. Gasket - Wikipedia

   en.wikipedia.org/wiki/Gasket

   The gaskets for flanges can be divided into four major categories: Sheet gaskets; Corrugated metal gaskets; Ring gaskets; Spiral wound gaskets; Sheet gaskets are simple, they are cut to size either with bolt holes or without holes for standard sizes with various thickness and material suitable to media and temperature pressure of pipeline.

6. Nitrile rubber - Wikipedia

   en.wikipedia.org/wiki/Nitrile_rubber

   The uses of nitrile rubber include disposable non-latex gloves, automotive transmission belts, hoses, O-rings, gaskets, oil seals, V belts, synthetic leather, printer's form rollers, and as cable jacketing; NBR latex can also be used in the preparation of adhesives and as a pigment binder. [citation needed]

7. Apollonian gasket - Wikipedia

   en.wikipedia.org/wiki/Apollonian_gasket

   An example of an Apollonian gasket. In mathematics, an Apollonian gasket or Apollonian net is a fractal generated by starting with a triple of circles, each tangent to the other two, and successively filling in more circles, each tangent to another three. It is named after Greek mathematician Apollonius of Perga. [1]

8. Space Shuttle external tank - Wikipedia

   en.wikipedia.org/wiki/Space_Shuttle_external_tank

   The LOX tank is located at the top [a] of the ET and has an ogive shape to reduce aerodynamic drag and aerothermodynamic heating. The ogive nose section is capped by a flat removable cover plate and a nose cone. The nose cone consists of a removable conical assembly that serves as an aerodynamic fairing for the propulsion and electrical system ...