Heavy-Duty Stainless Steel Build – Designed for strength and durability, this coupling securely joins no-hub cast iron soil pipes and fittings in drain, waste, and vent systems. Red Color Shield – Features a bright red shield for quick, easy identification during installation, ensuring accuracy and efficiency on the job site. Heavy-Duty Construction – Features 304 series stainless steel bands with a corrugated stainless steel shield, securely attached over a molded one-piece ElaStoplast sealing gasket for strength, flexibility, and leak-resistant performance. 4-Inch Pipe Compatibility – Engineered to securely join 4-inch no-hub cast iron soil pipes and fittings, providing a durable, leak-resistant connection for residential, commercial, and industrial plumbing applications Independent Sealing Clamps – Multiple clamps tighten separately to distribute load evenly, creating a stronger, more reliable seal and improved leak resistance.