IRN R550

When an independent inlet valve is used in conjunction with a cistern to form an independent flushing cistern or to form a WC suite, additional verification to validate backflow prevention arrangements is required. Please refer to the clarifications of the requirements of the Water Supply (Water Fittings) Regulations, Byelaws in Scotland, as they apply to Type AG and Type AUK1 air gaps in WC suites and the interim agreement.

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