What backflow protection is required for urinals?

All water fittings in a bathroom must be supplied via an appropriate and adequate form of backflow protection, one which is rated either equal to or higher than the highest downstream contamination risk (fluid category) for the type of backflow (back pressure or back siphonage) it is likely to be exposed to.

Urinals are considered to be a fluid category 5 risk.

1. A pressure flushing valve and Type DC device arrangement installed in accordance with the requirements of schedule 2 paragraph 25(c) in the relevant legislation in England, Wales, Scotland and Northern Ireland.

2. A flushing cistern which is supplied via an appropriate form of fluid category 5 backflow protection.