Submerged inlets to baths or washbasins in any house or domestic situation are considered to be examples of a fluid category 3 risk based on DEFRA guidance.
Submerged inlets to baths or washbasins in anything other than a house or domestic situation and sinks in any location are considered to be examples of a fluid category 5 risk based on DEFRA guidance .
A suitable backflow protection device for the fluid category risk should be installed upstream of this device.
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