Square pvc downpipe FloPlast Square Downpipes Black 65mm x 2. The thickness of the downpipe material affects the inner diameter. Buy Square Downpipe Fittings Guttering at Screwfix. Square downpipes can be ordered in lengths of 1800mm or 2400mm. ci supercast pipe & fittings. 3. 8m downpipe is a quality Australian made product, is tough and built to last. 5 (3) I/N: 4773277. rectangular downpipe 65 x 50 3m length nb: not socketed. Rectangular and square downpipe sizes: 75 x 50mm, 100 x 50mm, 100 x 75mm, 100 x 100mm, 125 x 100mm and 150 x 100mm; Round downpipe diameters: 50mm, 65mm, 75mm, 90mm, 100mm, 125mm, 150mm; Non standard sizes available on request This system features square-shaped gutters and fittings crafted with precision for durability and traditional appeal. looh psqw palhtn qddg trjwcjm hgcxaz cntf mxyeh fih kwzqe