Fernco Inc. P1006-43 4-Inch by 3-Inch Flexible Coupling For Concrete To Cast Iron Or Plastic Manufactured in china Easy to use Highly durable Flexible coupling For concrete to cast iron or plastic Positive seal against infiltration and exfiltration Leak proof, root proof and are resistant to chemicals, ultraviolet rays, fungus growth and normal sewer gases Connects pipes of same or different sizes and materials quickly and easily