Air gap
The air space between the free-flowing discharge end of a supply pipe and an unpressurized receiving vessel.
Source: Handbook of water and wastewater treatment plant operations
Wikipedia: https://en.wikipedia.org/wiki/Air_gap
The air space between the free-flowing discharge end of a supply pipe and an unpressurized receiving vessel.
Source: Handbook of water and wastewater treatment plant operations
Wikipedia: https://en.wikipedia.org/wiki/Air_gap
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