NIBCO 5817 Series ABS DWV Pipe Fitting, Cap, 3" Hub, 3-1/2" OD, 3" ID Cap for closing the end of a pipe or fitting Hub end for connecting to a male unthreaded pipe or fitting ABS-DWV for chemical and corrosion resistance, performance under wide temperature ranges, and light weight for quick assembly Smooth interior finish for reduced friction and material buildup Meets specifications ASTM D2661 and D3311 for quality assurance