Providing a Type AUK3 tap gap is maintained a trigger-operated hose attachment used to pre-rinse crockery and cutlery in non-domestic premises only requires the installation of backflow protection rated at least fluid category 2 to ensure separation of the hot and cold supplies.
Fluid category 5 : Type AUK3 tap gap
20 mm or twice the internal diameter of the tap connection whichever is the greater
For example: tap size | minimum tap gap |
8 mm | 20 mm |
10 mm | 20 mm |
12 mm | 24 mm |
15 mm | 30 mm |
20 mm | 40 mm |
Please note
If the tap gap cannot be maintained for any reason, for example the spring retraction system is damaged, alternative means of providing fluid category 5 backflow protection will be required.
If there are any further questions, please contact the local water undertaker for advice.
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