Stainless Steel 316 Cast Pipe Fitting, Hex Head Plug, Class 150, 1/4" NPT Male Hexagonal head plug for closing and terminating the end of a pipe Male National Pipe Taper (NPT) threads for use with female threaded pipes Hexagonal head for increased leverage and use with a wrench Made from stainless steel 316 for strength Meets standards ANSI B1.20.1 and ISO 49 for quality assurance