ASTRALPOOL SKIMMER WITH STANDARD MOUTH OPENING 15L 00249All of the components that are exposed in this range of skimmers come with a UV treatment. Made of ABS, they come with a weir flap and a flow regulator check valve. Bottom suction nozzle connection: 11 2 inner thread, 2 outer thread. Simultaneous connection to the main drain: 50 mm inner wall. Overflow connection: 40 mm. Leaf trap. Recommended flow rate: 7. 5 m3 h. It is recommended that one skimmer be installed for every 25 m2 of water surface area.