Stainless Steel 316 Cast Pipe Fitting, Cap, Class 150, 1/8" NPT Female Cap for closing the end of a pipe Female National Pipe Taper (NPT) threads for connecting to threaded male pipes Made from stainless steel 316 for strength Higher corrosion resistance than stainless steel 304 Conforms to specifications ISO 49 and ANSI 1.20.1 for quality assurance