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Wavin Osma SquareLine is a 100mm (4") square section gutter system with 61mm square pipe - suitable for a maximum roof area of 178m² (with one downpipe) Nominal 100mm (4") square profile gutter Available in 2 and 4m lengths For use with Wavin Osma SquareLine gutter fittings Conforms to BS EN 607:2004