The outlet 1074/2 does not require a borehole in the glass, and thus can be retrofitted. Even after an interruption of the recirculation pump, it will continue to operate. In combination with the outlet hose and fittings 1075/2, the outlet can be used up to abt. 1,200 l/h (317 USgal./h). With additional overflow pipe 1001.74 (cf. Turbelle® filter accessories), a throughput of 1,500 l/h (396 USgal./h) in total is possible.