An air break to drain is a type of fitting which can be used when making a connection to a wastewater system. It is not a recognised form of backflow protection.
A water fitting or appliance directly connected to a wastewater system is a contamination risk. To address this, and prevent contaminated water potentially entering the drinking water supply, there must be an air gap arrangement separating the discharge and wastewater pipework. Typically, this is achieved by installing an acceptable tundish arrangement or compliant air break to drain. Both must be able to accommodate the full flow of any discharge.
To be acceptable an air break to drain must conform to an appropriate performance specification such as this.
If a tundish is used an air gap has to be maintained between the discharge outlet and spillover level of the tundish.
For further information about installation of tundishes please refer to the relevant version of the Building Regulations.
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