Please Note: Due To Exceptional Demand Please Allow Up To 6 Weeks For Delivery. the Optional Greenhouse Guttering Diverter Is Required If You Want To Divert The Rainwater From The Two Separate Gutters Into One Water Butt - Designed To Be Used With The Harrod Superior Greenhouses Only. every Harrod Superior Greenhouse Is Supplied With Gutters, Downpipes, Bends And Brackets, All You Need To Collect Rainwater Into Two Water Butts. If You Want To Divert The Rainwater From Both Gutters Into One Water Butt Then You Will Need One Of These Additional Guttering Diverter Kits.