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watertight manhole

Manhole cover — Kraków manhole cover (note integral hinge). Modern manhole cover in Rome … Wikipedia
air plug — noun : a removable plug screwed into a watertight manhole or scuttle cover * * * a plug making an airtight seal to a vent … Useful english dictionary
Bulk tank — In dairy farming a bulk milk cooling tank is a large storage tank for cooling and holding milk at a cold temperature until it can be picked up by a milk hauler. The bulk milk cooling tank is an important piece of dairy farm equipment. It is… … Wikipedia
Pumping station — Pumping stations are facilities including pumps and equipment for pumping fluids from one place to another. They are used for a variety of infrastructure systems that many people take for granted, such as the supply of water to canals, the… … Wikipedia
USS Guitarro (SSN-665) — USS Guitarro (SSN 665), a Sturgeon class submarine, was the second ship of the United States Navy to be named for the guitarro, a ray of the guitarfish family. The contract to build her was awarded to Mare Island Naval Shipyard on 18 December… … Wikipedia
Atmospheric diving suit — Divers do not even need to be skilled swimmers.The ADS has variously been referred to as an armored diving suit, armored diving dress, articulated diving suit, Iron Duke, Iron Mike, and deep sea diving robot . The term atmospheric diving suit… … Wikipedia