Stainless Steel 316 Cast Pipe Fitting, Welding Spud, Class 150, 1-1/4" NPT Female Welding spud flange for joining two sections of a piping system Female National Pipe Taper (NPT) threads for connecting male threaded pipes Made from stainless steel 316 for strength Higher corrosion resistance than stainless steel 304 Meets specifications ISO 49 and ANSI 1.20.1 for quality assurance