Your water butt wont overflow thanks to this Harcostar Universal Rain Trap Diverter which will divert excess water back down the downpipe. This black Harcostar Universal Rain Trap connects to a round downpipe in the following
Sizes: 63mm, 68mm, 80mm & 100mm & also connects to a square downpipe in the following
Sizes: 61mm & 65mm Simply cut a section from your downpipe & insert the rain diverter. This Universal Rain Trap Diverter comes with a 0.5m quality flexible connecting hose, so your water butt doesn't have to be directly in front of a down pipe. Please note: This product NOT suitable for cast iron downpipes & some water butts may require a hole to be drilled in order to attach it. This is easy to do.