Eshopps PF1200 Overflow Box, 300 gal tank, Dual. These Overflow Boxes offer a convenient way to get water from your aquarium to the sump filter system. These Overflow boxes require only a 3” clearance behind your aquarium. Each box comes complete with U-tube siphon, cylinder foam filter pad, black pre-filter box, nylon screws and wing nuts to adjust the height of the pre-filter box and 1” bulkhead drain. All overflow boxes include followings: * siphon tube * cylinder foam * male & female adapters * nylon screw & wing nuts * pre-filter box PF1200 Specifications: * Dimensions: 10" x 3.25" x 10" * Intake Tube: Dual * Max. Water Flow: 1,200 GPH * Recommended Aquarium Size: 300 gal.