Enhance the quality of your harvested rainwater with our 3” or 4" First Flush Diverter Kit, an essential addition to any rainwater harvesting system. Designed to improve water purity, this kit diverts the initial runoff from your roof, which often contains dirt, leaves, and other contaminants, away from your storage tank, ensuring that only cleaner water reaches your tank. Our 3" and 4" First Flush Diverter Kit provides you with the pieces you need to build a great first flush system. You just need the 3" or 4" SCH40 PVC Pipe from your local hardware store to complete the installation.