This FloPlast square gutter hopper (185mm x 285mm) collects water from multiple downpipes or gutter runs. It allows higher capacity flow into the drainage system and connects with square-line pipes. This product is a black 65-68mm Universal Hopper. If you're looking for a quality universal hopper that can work with both Square Line and Half... Hoppers are used to bring together a collection of flows into one downpipe. Usually this would be different rainwater pipes from various sections of a roof coming together, such as pipes from a main roof and a porch roof.The hopper is essentially an open box into which the upper pipes discharge. The lower section of the hopper connects to a 68mm round or 65mm square downpipe.On occasion if there is a combined system of drainage on much older properties, hoppers are used to feed waste pipes from a bathroom into a rainwater downpipe. As combined drainage systems are no longer in use for new properties this is a much less common use for a hopper.Our PBSL Group short video introduction for this product can be viewed below;