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Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.
The City of Los Angeles also created an ordinance creating the Office of Plumbing Inspector as part of the city's Board of Health in 1887 [2] Later the City of Los Angeles adopted Ordinance No. 1656 May 1, 1893 [3] which established an examining board for master plumbers, registration of master and journeyman plumbers, requiring approval of the ...
This arrangement prevents any contaminants in the sink from entering into the potable water system by siphonage; this is the simplest form of backflow prevention. A common use of the term "air gap" in domestic plumbing refers to a specialized fixture that provides backflow prevention for an installed dishwasher. This "air gap" is visible above ...
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