Stainless Steel 304 Cast Pipe Fitting, Hex Bushing, Class 150, 1-1/4" NPT Male X 1" NPT Female, Hex bushing for connecting pipes of different sizes Male and female National Pipe Taper (NPT) threads for connecting two pipes Made of stainless steel 304 for greater strength than 302 grade steel Lower carbon content for greater resistance to corrosion Class 150 fittings conform to standards ANSI B1.20.1 and ISO 49 for quality assurance