Cascade Cast Iron Style 112mm x 4m Plastic Roundstyle Guttering - Black Available in up to 4m lengths, the guttering must slope gently downwards at least 12mm every 3m towards the running outlet in order to provide effective drainage. It should be fixed at 1m intervals with a gutter support bracket. The Roundstyle Cast Iron Style Rainwater System is synonymous with traditional cast iron styling and blends perfectly with the architectural detailing on heritage buildings, being virtually indistinguishable from original Cast Iron systems. The authentic styling of the Roundstyle system is suitable for both period styled new build and renovation projects alike. Features Authentic detailing and finish on guttering, downpipe, hoppers and fittings. Fully compatible with the Cast Iron Style Soil System and traditional Cast Iron. Available in six colour options: Classic Black, Oxford Blue, Olive Green, Graphite Grey, Sandstone, Porcelain White.14