Stainless Steel 304 Pipe Fitting, Hex Head Plug, Class 1000, 1" 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 Meets standards ASTM A182, ASME SA182, and ANSI B16.11 for quality assurance