NIBCO 4895 Series PVC DWV Pipe Fitting, Trap, 1-1/2" Hub Trap for creating a water seal in DWV systems to prevent gases from entering occupied spaces Hub ends for connecting to male unthreaded pipes or fittings PVC-DWV for corrosion resistance, high strength, and less weight than fittings made from metal Smooth interior finish for reduced friction and material buildup Meets specifications ASTM D2665 and D3311 for quality assurance