3" connection. Made of white ABS plastic. Suction. For liner and prefabricated pools comes with gaskets, flanges and screws. Flow rate adjusted by turning the grille. Suction surface area: 0.015 m2. Outer Ø 295 mm wall. Flow rate (0.4 m/s) 20 m3/h. Max. recommended flow rate compliant with standard EN 13451-1: 26 m3/h (0.5 m/s.).