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UL:
Uunderwriters Laboratories.


ULF:
Ultra Low Flush. Widely used description of 1.6 gpf or less toilets.


Ultracoil:
True double wall heat exchanger.


UNC:
Unified Nation Coarse Thread. A standard kind of coarse straight thread used on fittings, nuts, and bolts. Not for pipes.


Undercounter Sink:
Type of installation in which a lavatory or sink is attached to the underside of a countertop.


Underwriters Laboratories:
A non-profit organization that evaluates and classifies the health and safety rosks of carious materials and products.


UNF:
Unified National Fine Thread. A standard kind of fine straight thread used on fittings, nuts, and bolts. Not for pipes.


Uni-Fle:
One piece stop and riser combination. One-piece supply.


Uniformity Coefficient:
A measure of the variation in particle sizes of ion exchange resins and filter media. It is defined as the ration of the size of particle that has 60% of the material finer than itself, to the size of the particle that has 10% finer than itself.


Union:
A three piece fitting that joins two sections of pipe, but allows them to be disconnected without cutting the pipe.


Universal Plumbing Code:
A system of procedures designed to provide consumers with safe and sanitary plumbing systems and used throughout the United States by local jurisdictions.


Urinal:
A plumbing fixture which receives only liquid body waste and conveys the waste through a trap seal into a gravity drainage system.


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.


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.


USEPA:
United States Environmental Protection Agency.


USPHS:
United States Public Health Service.


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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