NIBCO 435 Series PVC Pipe Fitting, Adapter, Schedule 40, 1" Slip x NPT Female Adapter for connecting pipes or fittings of different types Slip opening on one end and female NPT threads on the other for connecting pipes with different ends 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