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| Pressure regulator (pr)
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Usually required if water pressure ever exceeds 80 PSI on potable water supplies inside a structure. |
| Pressure relief valve
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A device mounted on a hot water heater or boiler which is designed to release any high steam pressure in the tank and thus prevent tank explosions. |
| Pressure tank
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Device used to pump water from a well. |
| Pressure treated wood
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Wood, which is protected against rot and insects, by having a preservative fluid force into it under pressure. |
| Pressure tubing
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Tubing used to conduct fluids under pressure or at elevated temperatures or both, and produced to stricter tolerances than pipe. |
| Pressure-reducing valve
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Control valve, often found in a water system, which will reduce pressure between the inlet and outlet to maintain the set outlet pressure when there are fluctuations in the inlet pressure. |
| Pressure-treated wood
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Wood which has been impregnated with preservatives to resist decay. Use with caution in your garden area where vegetables or herbs will grow or are presently growing. |
| Prestressed concrete
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A development of ordinary reinforced concrete. The reinforcing steel is replaced by wire cables in ducts. |
| Prestressing or pretensioning
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Use of stretching steel cables, in a concrete form, so that tension is put on them prior to the placement of concrete. Even after the concrete has set and hardened, the steel stays in tension, to add to the concrete strength. |
| Preterit
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Past action(s) of a property owner or tenant. |
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