The Klir Flow Diverting Cap 4 inches is a convenient accessory designed to cap the unused holes of your sock tray. With its adjustable dial, you can effortlessly divert excess flow or adjust the filtration intensity to suit your needs. Whether you want to fine-tune the filtration process or reduce flow through certain areas of your filtration system, this flow diverting cap offers flexibility and customization options to optimize your aquarium's water quality and clarity.