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An external fill point for filling the fresh water tank made up of a large diameter hose that runs into the tank and incorporates a hole in the side of the RV which allows water to be fed, via a water hose, into the tank using gravity alone. A smaller diameter 'vent' hose is usually installed alongside to allow air to escape the tank when filling.
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
Pool drain vortex as viewed from above the water at Grange Park wading pool Underwater view of drain, showing vortex-formation phenomenon. A drain is the primary vessel or conduit for unwanted water or waste liquids to flow away, either to a more useful area, funnelled into a receptacle, or run into sewers or stormwater mains as waste discharge to be released or processed.
Old water pipe, remnant of the Machine de Marly near Versailles, France. Lead was the favoured material for water pipes for many centuries because its malleability made it practical to work into the desired shape. Such use was so common that the word "plumbing" derives from plumbum, the Latin word for lead.
Cement-mortar lined ductile iron pipe is a ductile iron pipe with cement lining on the inside surface, and is commonly used for water distribution. Cement-mortar lined ductile iron pipe is governed by standards set forth by DIPRA ( Ductile Iron Pipe Research Association ), and was first used in 1922 in Charleston, South Carolina .
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Ductile iron pipe in the developed world is normally manufactured exclusively from recycled material including scrap steel and recycled iron. [28] [29] The pipe can be recycled after use. [30] In terms of environmental impact, several studies have compared ductile iron pipe's impact on the environment with that of other pipe materials. [31]
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