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1. Valve plate with gasket 2. Inlet from basin overflow 3. Sealing rim 4. Screw for height adjustment 5. Ball joint 6. Actuator arm 7. Joint 8. Control arm . Some modern plugholes dispense with the need for a separate plug, having instead a built-in 'pop-up plug' operated by a handle on the sink, that can move up or down to open or close the ...
The reason for this is that when the boat is level, the drain or other opening will always be above the waterline, and so water will only flow out. At sea, when the boat rolls in the waves, the opening may sometimes be below the waterline. If the seacock is open, water may flood the boat, causing it to sink. Sea valve at lower right
3/4"x14 BSP parallel thread, [16] which has a 55° Whitworth thread form, a pitch diameter of 25.279 millimetres (0.9952 in) and a pitch of 14 threads per inch (1.814 mm); 3/4"x14 NGS [17] (NPSM) parallel thread, sealed by an O-ring, torqued to 40 to 50 N⋅m (30 to 37 lbf⋅ft) on aluminium cylinders, [18] which has a 60° thread form, a pitch ...
A scupper is an opening in the side walls of a vessel or an open-air structure, which allows water to drain instead of pooling within the bulwark or gunwales of a vessel, or within the curbing or walls of a building. Ship's bulwark. 1. Gunwale, 2. Bulwark plating, 3. Flange, 4. Stanchion, 5. Stringer plate, 6. Stringer angle, 7. Sheerstrake.
A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. In steam boilers the fusible plug is screwed into the crown sheet (the top plate) of the firebox, typically extending about 1 in (25 mm) into the water space above it. Its purpose is to act as a last-resort ...
A drain plug hole about 25 mm (1 inch) was drilled in the garboard plank on one side to allow rain water drainage. The oars did not use rowlocks or thole pins but holes cut below the gunwale line. To keep seawater out, these oar holes were sealed with wooden disks from the inside, when the oars were not in use.
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