3 Inch Permadrain Locking Dome Strainer Kit. Fits Zurn, Oatey, Wade, Josam, and Other Drain Brands The Locking Dome Strainer is ultimate strainer for floor sinks! Fits Zurn, Oatey, Wade, Josam, and Other Drain Brands This locking strainer protects floor sinks from debris while providing a free drain area for liquids to flow. Each kit includes two gaskets to ensure the proper fit of your Locking Dome Strainer into PVC or Cast Iron drain pipes.