Glossary of Plumbing Terms - U - Keidel Bath, Kitchen, Plumbing, Cabinetry, Appliances

Welcome to Keidel's Plumbing Glossary. Every industry and trade has its own standards and terminologies. This glossary is our attempt to help the general public understand some of the terms unique to our industry.

Our database contains over 1000 unique terms, compiled from a variety of public and private sources. To use the glossary efficiently you can click on the letter of the desired term that you would like to find. For example: click on "C" to find out about "Closet Augers" or "P" for "Petcock." Definitions listed here are provided without warranty.

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UL	Underwriters Laboratories
ULF	Ultra low flush. Widely used description of 1.6 gpf or less toilets.
UNC	Unified National Coarse Thread. A standard kind of coarse straight thread used on fittings, nuts, and bolts. Not for pipes.
UNF	Unified National Fine Thread. A standard kind of fine straight thread used on fittings, buts, and bolts. Not for pipes.
USEPA	The abbreviation for "United States Environmental Protection Agency"
USPHS	The abbreviation for "United States Public Health Service"
Ultracoil	True double wall heat exchanger
Uni-flex	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 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.
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.
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.
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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