Fernco Inc. P1002-44 4-Inch Clay To 4-Inch Cast Iron Or Plastic Coupling Clay to Cast iron or plastic Stainless Steel clamps Made in United states Coupling Positive seal against infiltration and exfiltration Leak proof, root proof and are resistant to chemicals, ultraviolet rays, fungus growth and normal sewer gases Connects pipe quickly and easily Stainless steel clamps are corrosion resistant and rustproof