The Ingenious Harcostar Downpipe Connector Rain Trap Will Fit All Regular Sized Downpipes Of 63, 68, 80 And 100mm Diameter, Plus 61 And 65mm Square. the Flexible 50cm Long Hose Allows The Water Butt Or Tank To Be Placed In The Most Convenient Position And Although Designed And Manufactured To Work With The Harcostar Range Of Water Butts, The Rain Trap System Easily Connects With Almost All Butts And Tanks.fits All Regular Sized Downpipes Of 63, 68, 80 And 100mm Plus 61 And 65mm Square Pipesnot Designed For Use With Cast Iron Downpipes50cm Long X 2.5cm Diameter Pipe