Translations:Pumpen, Betriebs- und Regenwasserwerke/127/en

• 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.