The Valterra DWV RV Sewer Coupling is designed to be installed with the Drain, Waste, or Ventilation (DWV) system in your RV. Built with durable ABS plastic, this fitting meets ASTM-D2661-2011 and CSA B181.1-2011 standards.• Intended for Drain, Waste, and Ventilation (DWV) Systems• For connecting two pipes together• For use with 3" diameter piping• Durable ABS plastic construction• IAPMO listed to standards ASTM-D2661-2011 and CSA B181.1-2011 For use with 3"" diameter piping Meets ASTM-D2661-2011 & CSA B181.1-2011 standards | Valterra DWV RV Sewer Coupling, 3" | ABS Plastic