Stramit® Downpipes are coated with Zinc-Aluminium / Zinc-Aluminium-Magnesium alloy and COLORBOND® steel, and will give excellent durability in almost all locations more than 200m from a marine environment or in some light industrial applications. Stramit round and fluted and round downpipes (with stormwater connectors) are available in a large range of lengths and diameters.