Marine Sources SOB-1 SOB-2 Aquarium Waterbox Siphon Overflow Box Supplies Fish Tank Aquatic Accessories Marine Sources SOB-1 SOB-2 Aquarium Waterbox Siphon Overflow Box Aquarium Supplies Fish Tank Aquatic Accessories _x000D_ _x000D_ _x000D_ Marine Sources Siphon Overflow Box hangs over the outside of the aquarium. 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 high quality acrylic and is available in two capacities: _x000D_ _x000D_ SOB-1 for up to 2,500 l/h (c. 625 gph) (L/W/H):18.7*19.7*26CM _x000D_ _x000D_ SOB-2 for up to 5,000 l/h (c. 1,250 gph) L/W/H):23.7*19.7*26CM _x000D_ _x000D_ MARINE SOURCES OVERFLOW BOX FEATURE: _x000D_ _x000D_ 1Removable safeguard comb- can protect the fish from entering the overflow box. The safeguard comb is removable; it is very easy to make a cleaning _x000D_ _x000D_ 2 The back chamber lid -can reduce the noise greatly. _x000D_ _x000D_ 3 Dual air-draining tubes design- can be connected to the Marine sources skimmer dual air silencer dual nipple. The air can be sucked out faster and safer _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_