Bronze Round Strainers will keep debris from entering water intake lines that do not require a scoop strainer.These Bronze Round Strainers were designed for use with an existing thru-hull fitting. Bronze strainers have an outer surface that is rough in feel and appearance, almost like its covered with sand. Thats because bronze strainers are sand cast, and then machined. Bronze is known for excellent resistance to harmful corrosion.Cast bronzeDrilled holesMarine UL ListedRequires #8 screws (sold separately)