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A flexible hose is described by two diameters, inner then outer: a 16/22 mm hose has a 16 mm bore and a 22 mm overall diameter. It is the inner diameter that fits onto the pump or filter connector. EHEIM hose comes in 9/12 to 25/34 mm, in 3 m lengths or 30 to 70 m rolls, and PVC hose sold by the metre ranges from 4 × 7 to 18 × 22 mm.
To pass through the wall of a tank, there are two options: the solvent-weld PVC tank connector, in 32 mm for a 43 mm hole or 40 mm for a 54 mm hole, and the rubber uniseal, which fits into a 39 mm hole for the 25 mm model. Barbed fittings, tees and Y-pieces branch a flexible hose without glue. The float valve holds a constant level without electricity, gravity-fed from a container. Shut-off valves, non-return valves and brushes complete the maintenance of the circuit. To design the whole system, see the article Building your own aquaponic system.















