DWV Fittings: Understanding Drain, Waste & Vent Systems
DWV fittings are essential components in a plumbing system’s drain, waste and vent (DWV) network. Unlike supply piping, these fittings are designed for gravity‑driven flow and venting rather than pressurized water delivery. They join pipes that remove wastewater and facilitate air circulation so that drains operate smoothly and traps retain their water seal. Materials and Design DWV fittings are typically made from corrosion‑resistant materials such as PVC, ABS or cast copper. They feature smooth interior walls and sweeping bends to maintain flow velocity and reduce
