Stainless Steel 316 Pipe Fitting, Coupling, Class 1000, 1-1/2" NPT Female Coupling for connecting and extending pipes going in the same direction Female National Pipe Taper (NPT) threads for connecting male pipes Made from stainless steel 316 for strength Higher corrosion resistance than stainless steel 304 Conforms to specifications ASTM A182, ASME SA182, and ANSI B16.11 for quality assurance