Stainless Steel 304 Pipe Fitting, Cap, Class 1000, 1-1/2" NPT Female Cap for closing the end of a pipe Female National Pipe Taper (NPT) threads for connecting to threaded pipes Made of stainless steel 304 for strength Lower carbon content for greater resistance to corrosion Conforms to specifications ASTM A182, ASME SA182, and ANSI B16.11 for quality assurance