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Quality overflow boxes feature bulkhead fittings for secure and convenient installation. Easy-to-install siphon overflow box! Requires just 3” between aquarium and wall. Use these easy-to-install overflow boxes to transport aquarium water to under cabinet sumps, refugiums, or wet/dry filters. Gravity-feed system eliminates the need for complicated drilling or aquarium modifications. Includes: U-tube, cylinder (round) foam, nylon screw and wing nuts, and pre-filter box. Nano has 3/4 Inch bulkhead, PF-300 - PF-1200 have 1 Inch bulkheads, and PF-1800 has 1-1/2 Inch bulkhead. PF-300, 6” X 3” X 10”, UP TO 75 GALLONS, SINGLE INTAKE, 300 GPH MAX FLOW.