New York Underground
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[Water Grid]


2.  REGULATORS
Without regulators New Yorkers would face stinging showers and cups shattering under the pressure from a household faucet. Like gas or electric utilities, water pressure must be reduced to usable levels. Riser shafts with regulators connect giant 20-foot (7-meter) tunnels to water mains. Water enters buildings in pipes from .75 to 8 inches (19 to 203 millimeters) in diameter.

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