A water butt connector like this Standard Rain Diverter Kit collects the rainwater that falls on your roof for use in the garden or other potential outdoor jobs. This Rain Diverter Kit fits standard 68mm round or 65mm square plastic downpipes. Simply cut a section from your downpipe and insert the rain diverter. It will also prevent the water butt from overflowing when it\'s full by diverting excess water back into the downpipe. This Rain Diverter Kit includes: 500mm of hose, all required connectors and washers and full fitting instructions. Please note:This is not suitable for cast iron downpipes and some water butts will require drilling in order to attach. Connecting hose: 20mm inside diameter