Used the Rain Collector Rapido fit Quattro water butt diverter for rectangular and square downpipes. Fitting very straight forward but connecting hose could have been twice the length with jubilee clips provided as the connector dripped a bit when the water butt was full. Feel the hole cutter was not needed in every kit & could be sold separately. Neat installation but feel the connector might be more secure with a wrap-around steel strap, not just one screw. Neat installation & prevented having to cut through the whole down-pipe. Good collection of water. A bit pricey compared to a standard water diverter but would recommend. The shut-off tap could be useful during the winter if no collection is required. A bit pricey compared to a standard water diverter but would recommend.