Perko Round Strainer 4" Bronze 0086-DP4-PLB by Perko $35.77 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Perko Round Strainer #9-0086DP4PLB Cast Bronze, Drilled Holes. Outside Diameter: 4". Inside Diameter: 3". Max Hull Thick: 1-1/4". # 8 Fasteners. UL Listed. NOT TO BE USED IN POTABLE WATER SYSTEMS.