Harcostar Rain Diverter Kit The Harcostar Rain Diverter Kit is a simple and effective way to direct rainwater from a downpipe into a water butt, helping you collect and reuse rainwater around the garden. Designed to connect between your household downpipe and water butt, the diverter allows rainwater to flow into the container while helping to reduce the risk of overflowing once the water butt is full. Ideal for gardeners looking to make better use of natural rainfall, this practical kit provides a convenient solution for topping up a water butt throughout the year. A useful addition to any rainwater collection setup and a great way to reduce reliance on mains water for everyday garden watering.