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| U-BOLT
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A bolt shaped like the letter "U," with threading on both straight sections. |
| U-HANGER
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A metal fastener used to attach pipes to wooden joists under a floor. |
| U-VALUE
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The overall coefficient of heat transfer of an assembly measured in BTUs per square foot, per degrees Fahrenheit difference in temperature per hour. |
| U.S. DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT (HUD)
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Federal Agency overseeing the Federal Housing Administration, in addition to a number of housing and community development programs. |
| U.S. GALLON
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Measurement of liquid volume equal to 128 ounces (4 quarts). |
| UF WIRE
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Plastic insulated cable used for underground wiring. |
| ULLAGE
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The empty portion of a partially filled tank. |
| ULTIMATE ANALYSIS
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A procedure for determining the primary elements in a substance (carbon, hydrogen, oxygen, nitrogen, sulfur, and ash). |
| ULTIMATE STRENGTH
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A maximum force an object can tolerate before failure. |
| ULTRA LOW FLUSH (ULF)
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Widely used description of 1.6 gpf or less toilets. |
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