Bass Pro Shops screw-on, stainless steel wire mesh Aerator Strainer is designed to keep out trash, fish scales, and other debris that can clog drains in baitwells or pump impellers in aeration systems. The Aerator Strainer works with through-hull type, or in livewell or baitwell drains. Features include formed stainless steel wire mesh and a molded PVC base with internal threads. A black base has 3/4 female pipe threads. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Aereator & Bilge.