The universal rain trap is for connecting a water butt to a rain downpipe. This flexible fit trap will fit any standard plastic down pipes, including round downpipes 63mm, 68mm, 80mm and 100mm, as well as square downpipes 61mm and 65mm. It is not suitable for use with cast iron down pipes. Ideal for collecting rain that falls on your house, shed or greenhouse roof directly from your rain down pipe. NB Do not use an electric drill if the Butt contains any water.