The Ingenious Harcostar Downpipe Connector Rain Trap Will Fit All Regular Sized Downpipes Of 63, 68, 80 & 100mm Diameter, Plus 61 & 65mm Square. the Flexible 50cm Long Hose Allows The Water Butt Or Tank To Be Placed In The Most Convenient Position & Although Designed & Manufactured To Work With The Harcostar Range Of Water Butts, The Rain Trap System Easily Connects With Almost All Butts & Tanks.fits All Regular Sized Downpipes Of 63, 68, 80 & 100mm Plus 61 & 65mm Square Pipesnot Designed For Use With Cast Iron Downpipes 50cm Long X 2.5cm Diameter Pipe