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The visible water surface in a toilet is the top of the trap's water seal. Each fixture drain, with exceptions, must be vented so that negative air pressure in the drain cannot siphon the trap dry, to prevent positive air pressure in the sewer from forcing gases past the water seal, and to prevent explosive sewer gas buildup.
A swing check valve (or tilting disc check valve) is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle.
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
A Tesla valve, called a valvular conduit by its inventor, is a fixed-geometry passive check valve. It allows a fluid to flow preferentially in one direction, without moving parts. The device is named after Nikola Tesla , who was awarded U.S. patent 1,329,559 in 1920 for its invention.
A seal dribble is a form of dribbling in association football. It is performed by flicking the ball up from the ground onto the head, whereby the player then proceeds to run past opponents, whilst bouncing the ball on top of his forehead, imitating a seal. [1] The seal dribble makes it very hard for the defending team to challenge legally.
Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.
· The Nutcracker · The Odd Couple (play) · The Office (American TV series) · The Old Man and the Sea · The Onion · The Open Championship · The Open Society and Its Enemies · The Oprah Winfrey Show · The Oregon Trail (1971 video game) · The Origins of Totalitarianism · The Passion of Joan of Arc · The Peacock Room · The Pearl Island ...
Umbrella branding (also known as family branding) is a marketing practice involving the use of a single brand name for the sale of two or more related products. [ 1 ] [ 2 ] Umbrella branding is mainly used by companies with a positive brand equity (value of a brand in a certain marketplace). [ 3 ]
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