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| Many terms, such as escutcheon, have a specific meaning in plumbing. Look up your term here for a helpful boost in the right direction. |
| Undercounter Type of installation in which a lavatory or sink is attached to the underside of a countertop. Undercounter installation makes counter cleaning easy.
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| Undercover The underside portion of some faucets which also use a top shroud to cover an assembled faucet waterway. It seats against the faucet deck or lavatory, and is not typically visible from the normal level of use. The undercover is similar in application to a throatplate.
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| Union A fitting to join two pipes so they can be dismantled.
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| Union ell A fitting to join two pipes so they can be dismantled which also changes the direction of the pipe flow.
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| Union joint The joining of two pipes so they can be dismantled with a union connection.
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| Union nut A relatively large nut which fits over all but the flanged sealing surface of a union fitting.
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| Universal connection Allows the installer to make a sweat connection or threaded connection to the tub/shower valve bodies.
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| Urinal Water-flushed plumbing fixture designed to receive only liquid waste which is conveyed through a trap seal into a gravity drainage system. KOHLER urinals offer either washout, blowout or siphon jet flushing systems.
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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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| Utility sink Deep fixed basin, supplied with hot and cold water, which is used for rinsing of mops, disposal of cleaning water. Kohler's Sutton utility sink is the perfect handyman's sink for garage, workroom or basement.
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