Adapter for connecting pipes or fittings of different types; Socket opening on one end and male NPT threads on the other for connecting two pipes with different ends; PVC for chemical and corrosion resistance, high strength, and less weight than fittings made from metal; Meets ASTM D1784 and D1785 standards for quality assurance, and meets NSF standards 14 for plastic piping and 61 for potable water service