Fernco Donuts 2" Cast Iron Hub Donut. It connects 2" service weight cast iron pipe to plain end of 2" DWV Schedule 40 plastic pipe. It is corrosion resistant, flexible, Lead-Free, removable, UV resistant, underground rated, and underground use. The Fernco 2 inch PVC Compression Coupling eliminates the need for cement and mortar. It is ideal for compression sealing cast-iron sewer pipe. It seals drain, waste and vent connections. The PVC is resistant to chemicals, UV rays and fungus growth. Packaging: 1 Pack.