Type AUK2 – Domestic tap gap

The height of air gap between the lowest part of the outlet of a tap, combination fitting, shower head or other fitting discharging over a domestic sanitary appliance or other receptacle, and the spillover level of that appliance, where a fluid category 2 or 3 risk is present downstream. 

Maximum permissible fluid category against which a Type AUK2 tap gap is accepted as adequate backflow protection:

Backflow by back pressure:  not acceptable for protection against back pressure from any fluid category 

Backflow by back siphonage: fluid category 3

Interpretation given in Regulators’ Backflow Specification - backflow prevention arrangements and devices: backflow prevention arrangements

We use cookies to give you the best possible experience with Water Regs UK. Some are essential to provide website functions and ensure the website is secure. We also use cookies to help us understand how people use the site and to make improvements. Click "Accept All" to enable recommended settings or click "Manage cookies" to adjust your settings. For more details, see our Cookie Policy.