Fernco's 4"x1-1/2" Flexible Repair Coupling is for connecting 4" cast iron or plastic pipes to 1-1/2" cast iron or plastic pipes. Made of specially formulated PVC, this coupling ensures a positive seal for any sewer and drain connections. The included 300 series stainless steel clamps are corrosion-resistant and rustproof, providing long-lasting durability. Suitable for drain, sewer, vent, and waste applications, this coupling has a pressure rating of 4.3 psi and an operating temperature range of -30 to 140 degrees Fahrenheit. It is designed to accommodate cast iron, plastic, copper, steel, or lead pipes, making it a versatile choice for various plumbing projects.