For connecting to an under tank filter system
The Aqua Medic overflow box hangs over the outside of the aquarium. A constant water level is maintained after the start of the overflow. Water circulation is achieved by pumping the water from the sump into the aquarium, and then via the overflow box back into the sump. This makes it possible to connect aquaria to under the tank filter systems without having to drill holes in the aquarium. The overflow box is manufactured from acrylic and is available in two capacities: OFB 2500 for up to 2,500 l/h (c. 625 gph)
OFB 5000 for up to 5,000 l/h (c. 1,250 gph)
Dimensions:
OFB 2500 (l x w x h): 19 x 18 x 25 cm (c. 8 x 7.2 x 10)
The OFB has connections for pvc pipe 32 mm. The OFB 25000 has one the OFB 5000 two connections