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TERM
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EXPLANATION
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DI |
Abbreviation for "deionization"
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DWV |
Drainage, waste, and vent systems, which remove
wastewater. Not for drinking water. |
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Dam |
The barrier built into a trapway of a toilet
that controls the water level in the toilet bowl. |
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Deck Mount |
Describes a faucet that is mounted on the
deck of the bathtub enclosure, rather than on the rim of the bathtub or
on the wall. Also referred to as a Roman spout faucet. Also known as a
sunken tub, the deck-mount tub is usually mounted on a platform and has
no apron or decorative side. |
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Deep Well |
A well more than 25 ft. deep |
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Degree Rise |
The difference between the starting water
temperature and the ending temperature after heating is complete. |
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Deionization |
The process of reducing water to a non-mineral
state by passing it over a bed of resins |
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Deionized Water |
Water free of inorganic materials. |
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Desanco Fitting |
A type of compression adapter that connects
tubular brass fittings to pvc pipe. |
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Dew Point |
Temperature at which water vapor condenses
to a liquid. |
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Dial Plate |
Trim piece found behind a single-control wall-mount
faucet handle. Also known as a face plate. |
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Diaphragm |
Flexible membrane in a valve that deflects
down onto a rigid area of the valve body to regulate water flow from the
supply lines. This eliminates the possibility of debris build-up within
the valve. |
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Die |
Cutting device used to thread pipe. A set
of these attach to die-heads, and mounted on a threading device.
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Diffuser |
Device for reducing the velocity and increasing
the static pressure of a fluid passing through a system |
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Dilution Air |
Air that enters a draft hood or draft regulator
and mixes with the flue gasses. |
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Dip Tube |
Tube inside the water heater that sends cold
water to the bottom of the tank. |
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Direct Tap |
Clamping device that allows a branch line
to be drilled and tapped off a main line. |
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Direct Vent |
A system that pulls outside air for combustion
and vents combustion gases directly outside without using a chimney. |
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Directional Jet |
Whirlpool air discharge unit with pivot allowing
discharge path to be adjusted by the user. Directional Tee Tee fitting
that allows direct flow in one direction by use of an internal baffle. |
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Discharge Head |
Difference in elevation between the liquid
level of the discharge tank and the centerline of the pump. Also includes
any additional pressure head that may be present at the discharge tank
fluid surface. |
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Discharge Tube |
Outlet tube that connects a disposer or sump
pump to the drain line. |
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Disposal Field |
A series of trenches conveying the effluent
from the septic tank laid in such a manner that the flow will be distributed
with reasonable uniformity into natural soil. |
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Dishwasher Tailpiece |
A flanged adapter connecting a basket strainer
to the drainpipe with a dishwasher inlet. |
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Diverter |
A valves that directs fluid to various outlets.
They are used in showers, tubs, bidets, and sinks. |
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Dope |
Pasty lubricant used on seal pipe threads
prior to making a threaded pipe connection. |
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Double Extra Strong |
Standard pipe weight designation (XXS). Sometimes
described as XXH (double extra heavy). |
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Double Horizontal Tee |
A PVC tee with twin outlets of a smaller diameter
than the inlet. |
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Double Threshold |
A shower base used in a corner application
where one threshold is used as an entrance and the other has a glass wall.
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Double Suction Pump |
A pump where the rotor is suspended between
two bearings with the fluid entering on either side of the impeller. Used
at higher capacities. |
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Double Wye Fixture |
A fitting that has branches coming in at an
angle from each side of the main to join the main run. |
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Down Head Boring Gimlet |
A flexible cutting tip for an auger cable.
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Draft Diverter |
A device fitted in the flue way of a gas appliance
to prevent updraft, downdraft, or the secondary flue blockage from obstructing
the escape of combustion gases. |
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Drain |
Any pipe that carries wastewater or water-borne
waste. |
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Drain Hub |
Floor drain used with hubbed soil pipe. The
bell (hub) section is counter-sunk vertically in the floor and covered
by a flush-mounted grill. |
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Drain Seal Gasket |
Gasket used to seal a drain to a sink to prevent
leaks. |
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Drain Valve |
Device designed to allow drainage of stored
contents from a water heater. |
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Drainage Tile |
Pipe-shaped clay tiles installed in below-grade
trenches for gravity-rated drainage. PVC pipe is now commonly used for
this purpose.
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Drawdown |
The distance the water level drops below the
standing water level while the pump is operating. |
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Drip Channel |
A metal channel that is designed to
prevent water running down a shower door from dripping onto the floor
when the door is opened. |
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Drip Leg |
A stub end pipe placed at a low point in the
gas piping to collect condensate and permit its removal. |
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Drum Trap |
An obsolete, non-vented drain lead or cast
iron canister trap formerly used in sewer lines. |
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Dual Element Heater |
An electric water heater with an upper and
lower element for heating water. |
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Duostrainer |
Sink drain fitting consisting of a strainer
body attached to the drain opening and a removable basket. Also called
a strainer. |
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Duo Valve |
A twin valve (hot & cold) with a single on/off
lever used for washing machine boxes |
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Duplex Basin |
An ejector pump container, usually 30" x 36"
or 36" x 36" large enough for two pumps, used in multi-family buildings
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Duraflow |
A process patented by Ace Duraflow Company
to rejuvenate old corroded plumbing by cleaning and lining with an Epoxy
coating. |
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Dynamic Pressure |
The pressure when the water is flowing.
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