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The drinking water must be separated from the non-potable water by an „air-gap“ in order to prevent the backflow of contaminated water into the drinking water installation through a continuous unhindered free flow path. The distance from incoming drinking water and the max. possible water level on the non-potable side is defined as follows: H ≥ 2 x d (inlet of the drinking water pipe), otherwise min. 20 mm.
Only the design forms type AA and AB “air-gap” are allowed according to EN1717<ref name="DIN1717">DIN EN 1717</ref>. Non-return valves (check valves), pipe splitters as well as pipe interrupters are not sufficient for separation and are therefore not allowed.
Double connections on cistern flush toilets are not allowed.
The “air-gap” must be installed as backwater safe.