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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