Flexible Coupling Compatible with cast Iron, plastic, copper, lead, and steel piping Flexible Connectors are Leak-Proof, Rot-Proof and Sealed Against Infiltration and Exfiltration, May be used for Non-Pressure Drain, waste, and vent (DWV) piping Systems and sewer Systems indoors and outdoors Rated for underground use Flexible 2" Tee Coupling with Stainless Steel Clamps