Cascade Cast Iron Style 68mm Plastic Plain Coupler - Black Allows more than one donwpipe to be connected in series. Cast iron connectors are sometimes decoratively branded. Plastic downpipes may, however just join by sitting the upper pipe inside the lower without connectors which creates a watertight seal. 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. Incorporates 68mm Round Downpipe. Choice of Ogee, Bath, Gothic and motiffed hopper designs. Available in six colour options: Classic Black, Oxford Blue, Olive Green, Graphite Grey, Sandstone, Porcelain White.