NIBCO 447 Series PVC Pipe Fitting, Cap, Schedule 40, 1-1/2" Slip Cap for closing the end of a pipe or fitting Slip opening for connecting to a male unthreaded pipe or fitting PVC 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 D2466 and D1784 for quality assurance