What is a type AB air gap?

A Type AB air gap is a non-mechanical backflow prevention arrangement comprising of an inlet, receiving tank and unrestricted weir overflow (rectangular or non-circular).

A weir air gap (Type AB) is needed to stop contaminated water mixing with the mains water and sits directly below the water discharge point.

TankBoost CAT 5 water tank features an air gap between the inlet and outlet to ensure that the water in the tank or cistern does not flow back into the mains supply.