Type AB – Air gap with weir overflow definition
Type AB – Air gap with weir overflow means a non-mechanical backflow prevention arrangement of water fittings complying with Type AA, except that the air gap is the vertical distance from the lowest point of the discharge orifice which discharges into the receptacle, to the critical level of the rectangular weir overflow.
Type AB – Air gap with weir overflow. (Fluid 5) means a non-mechanical backflow prevention arrangement of