This Speedy Rain Water Diverter Collector with Filter is called Speedy, as it can be installed in just five minutes. Grafs water harvesting system will work by following three simple steps are, drill, plug, done so the distance between the downpipe and wall is irrelevant. Can be fitted to aluminium, cast iron or PVC downpipes. No removal of the downpipe for the max. 50mm installation Distance between downpipe and wall is irrelevant Including filter and overflow function Summer/winter operation Downpipe sizes 70-100 mm Including core drill and connection seal Max. roof area 80mm Hose Diameter 32mm Hose Length 400mm