Think of a faucet (outlet) and sink basin (receptacle): water that leaves the faucet flows across empty air into the basin. That space is between the fixture outlet and the 'flood level rim' of a receptacle (be it a sink, floor drain, standpipe, or other approved unit). Contamination can occur in a backflow event, where either siphoning or a difference in pressure in the supply line can draw the contents of a directly-connected drain line into the clean water supply.Air gaps prevent cross-connections and contamination by discharging water and waste across an unobstructed space (a gap of air). Should they come into contact (a 'cross-connection'), the potable water supply can be seriously compromised. In the event of a drain back up or flood, the contents of the drain line should never be able to make contact with the water supply - the two plumbing systems (for potable water and for waste) should always remain separate. What is an Air Gap?An air gap is the most simple and effective means of preventing contamination of a potable water supply.Once potable water leaves the outlet of a fixture, it's either used or sent down the drain. Air Gap Installation For Water Softener Systems.
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