Overflow for supplementary installation with surface and bottom suction up to about 1,200 l/h (317 USgal./h). No boreholes in the glass required, and thus to be retro-fitted easily. Even after an interruption of the recirculation pump, it will continue to operate automatically. With additional U pipe 1001.74 (cf. Turbelle® filter accessories), a throughput of 1,500 l/h (396 USgal./h) is possible. Water outlet diam. 40 mm (1.57 in.). For easy installation and quiet operation, we recommend the use of overflow hose set 1075/2.