Harcostar Overflow Kit The Harcostar Overflow Kit provides a practical solution for directing excess water away from your water butt once it reaches capacity. Designed to help manage overflow safely and efficiently, the kit allows surplus rainwater to be routed to a suitable drainage point, helping to reduce unwanted spillage around the water butt and surrounding area. Supplied with a flexible hose, elbow connector, washer and securing nut, the kit offers a straightforward way to complete or upgrade a rainwater collection system. Ideal for use with compatible Harcostar water butts where controlled overflow management is required.