A one-way valve, which allows air into a drainage system, found
by a basin or at the top of an internal soil pipe to balance
pressures and prevent the water in U-bends being sucked out.
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A bubble of air that gets to the top section of piping and cannot
be pushed out by the pipe contents and reduces the flow of the
content of the pipe.
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Sometimes if a plug of water is traveling down a drain, it will
act as a piston and lower the pressure behind it, pulling out
the water in U-bends. This is known as a back-siphon.
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An item of the sanitary ware in bathrooms fed by a cistern -
a closed-lid tank located in the roof space.
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The open vessel with removable lid within which the inlet of
new water is controlled by a ball float valve. Cisterns exist
to maintain a back-up water supply for toilets in the event
of water failure and to prevent back siphonage into the fresh
water mains.
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A copper or stainless steel pipe joint fitting that forms a
seal by internally crushing a soft copper ring onto the pipe.
Easy to fit and remove, but more expensive, unsightly and bulky
than a soldered joint.
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The material used for hot and cold water pipes, generally 15mm
to basins and mains fed taps and 22mm to baths.
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The soil pipe that rises vertically through a house from the
drainage connecting toilets, baths and basins.
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The small open cistern, usually referred to as a tank, that
feeds the radiator water in central heating.
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This is the hot water cylinder where the water for basins and
baths is heated by a coil of piping inside the cylinder or tank.
The coil of piping is connected to the central heating system
and acts as a radiator.
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The toilet waste outlet, which passes horizontally into the
drainage system.
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A water heating system for hot water to baths and basins which
is sealed. Instead of the vent found in a header tank, a pressure
vessel controls pressure. The advantage is that the pressure
is high and so good for showers. Current Building Regulations
require that if fitting this system, the details are submitted
as a formal application for approval.
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A vertical water pipe carrying the mains water supply.
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The toilet waste outlet that passes vertically downwards into
the drainage system.
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The sanitary ware in a kitchen fed by the mains cold supply
direct.
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A U-shaped pipe system, which maintains a residual amount of
the waste water to prevent, smells from the drains coming back
into the house.
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Unplasticised polyvinyl chloride, now increasingly avoided due
to environmental restrictions, but still in use for drainage
pipes and window frames.
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