Stainless Steel 304 Cast Pipe Fitting, Flange, Welding Spud, Class 150, 1/2" NPT Female Welding spud flange for joining two sections of a piping system Female National Pipe Taper (NPT) threads for use with male threaded pipes Made of stainless steel 304 for strength Low carbon content to ensure greater resistance to corrosion Meets specifications ASTM A182 and ASME SA182 for quality assurance