Concrete pool - Inlets Pool floor return inlet. Outer 2" thread, int. Ø 50 mm. All-in-one return inlet and suction nozzle. Adjustable flow rate. Made of ABS plastic and screws in stainless steel. Maximum recommended flow rate compliant with standard EN 13451-1: 12 m3/h. Complies with standards: EN 16582-1 EN 16713-2