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TERM
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EXPLANATION
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UL |
Underwriters Laboratories
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ULF |
Ultra Low Flush. Widely
used description of 1.6 gpf or less toilets. |
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UNC |
Unified National Coarse
Thread. A standard kind of coarse straight thread used on fittings, nuts,
and bolts. Not for pipes. |
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UNF |
Unified National Fine
Thread. A standard kind of fine straight thread used on fittings, buts,
and bolts. Not for pipes. |
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USEPA |
United States Environmental
Protection Agency |
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USPHS |
United States Public
Health Service |
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Ultracoil |
True double wall heat exchanger. |
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Uni-flex |
One piece stop and riser combination. One-piece
supply. |
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Uniformity Coefficient |
A measure of the variation in particle sizes
of ion exchange resins and filter media. It is defined as the ratio of
the size of particle that has 60 percent of the material finer than itself,
to the size of the particle that has 10 percent finer than itself.
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Union |
Three piece fitting that joins two sections
of pipe, but allows them to be disconnected without cutting the pipe.
Used primarily with steel pipe; never in a DWV system. |
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Universal Plumbing Code
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A system of procedures designed to provide
consumers with safe and sanitary plumbing systems and used throughout
the United States by local jurisdictions. |
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Urinal |
A plumbing fixture which receives only liquid
body waste and conveys the waste through a trap seal into a gravity drainage
system. |
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Urinal Strainers |
Refers to a domed metal piece fastened to
the bottom of an urinal to prevent debris from plugging the trapway of
the unit. |
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Usable Storage |
Percentage of hot water that can be drawn
from a tank before the temperature drops to a point that it is no longer
considered hot. |
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Utility Sink |
Deep fixed basin, supplied with hot and cold
water, which is used for rinsing of mops, disposal of cleaning water. |
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