Spears 429-FE Series PVC Pipe Fitting, Fabricated, Eccentric Reducer Coupling, Schedule 40, 4" x 2-1/2" Socket Reducer coupling for connecting and extending two eccentric pipes of different diameters Socket ends for connecting to unthreaded male pipes or fittings PVC for corrosion resistance, high strength, and less weight than fittings made from metal Smooth interior finish for reduced friction and material buildup Meets ASTM 1785 for quality assurance and NSF certification for potable water