Fernco Inc. P1006-44 Flex Coupling Concrete To Cast Iron Or Plastic Concrete to Cast iron or plastic Easily Fits and this is easy to install Made in United states Specially formulated PVC compound positively seals any sewer and drain connection Positive seal against infiltration and exfiltration Leakproof, rustproof Connects pipes of same or different sizes and materials quickly and easily Stainless steel clamps are corrosion-resistant and rustproof