The Rothenberger Steel Drain Test Plugs, with a diameter of 9 inches, are designed for reliable drainage testing in various plumbing applications. Made from high-quality steel, these plugs offer exceptional durability and resistance to wear and tear. They create a secure, watertight seal, making them ideal for both residential and commercial drainage systems. These plugs meet industry standards for safety and performance, ensuring peace of mind during testing. Their user-friendly design allows for quick installation and removal, making them an essential tool for plumbing professionals.