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A simple example is the vertical space between a wall-mounted faucet and the sink rim (this space is the air gap). Water can easily fall from the faucet into the sink, but there is no way that water can be drawn up from the sink into the faucet.
In addition, performance issues with low-flow faucets often pertain to their ability to properly rinse or wet. In the United States the EPA's WaterSense has established minimum flow rates for lavatory fixtures to ensure satisfaction with low water pressures. [18] Leaking fixtures can contribute to significant water waste.
A trap primer automatically injects water into a trap, maintaining a water seal to keep sewer gas out of buildings. It must be installed in an easily accessible place for adjustment, replacement, and repair. A trap primer, a specialized valve, is usually connected to a clean-water supply in addition to a DWV system. [21]
Reading drawings and specifications, to determine the layout of water supply, waste, and venting systems; Detecting faults in plumbing appliances and systems, and correctly diagnosing their causes; Installing, repairing and maintaining domestic, commercial, and industrial plumbing fixtures and systems
Daniel Dicus of Ross Plumbing in Leesburg, Florida, describes one egregious tactic used to corner customers after taking apart their faucet to perform a diagnostic check: "They'll take the faucet ...
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A semi-schematic diagram combines some of the abstraction of a purely schematic diagram with other elements displayed as realistically as possible, for various reasons. It is a compromise between a purely abstract diagram (e.g. the schematic of the Washington Metro) and an exclusively realistic representation (e.g. the corresponding aerial view of Washington).
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