Stainless Steel 304 Cast Pipe Fitting, Hex Head Plug, Class 150, 1/4" NPT Male Hex head plug for closing and terminating the end of a pipe Male National Pipe Taper (NPT) threads for use with female threaded pipes Made of stainless steel 304 for greater strength than 302 grade steel Hexagonal head for increased leverage and use with a wrench Conforms to standards ISO 49 and ANSI B1.20.1 for quality assurance