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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) SquareLine 67.5° branch for 61mm downpipe Extensive range of other downpipe fittings available For use with SquareLine 100mm square section gutter system Ideal for domestic housing projects