Spears 435-G Series PVC Pipe Fitting, Adapter, Schedule 40, Gray, 3" Socket x 3" NPT Female Adapter for connecting pipes or fittings of different types Socket connection on one end and female NPT threads on the other for connecting two 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 NSF/ANSI 61 Annex G, NSF/ANSI 372 for quality assurance