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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) Joins two ends of SquareLine gutter at 45° Enables gutter run to continue around a corner Retained seal to provide secure, watertight joint Flexiclip gutter jointing mechanism for ease of installation Range available in Black, White and Brown