Stainless Steel 316/316L Pipe Fitting, Close Nipple, Schedule 80, Seamless Extra Heavy, 1" NPT Male, 1-1/2" Length Nipple for connecting and extending pipes Male National Pipe Taper (NPT) threads for connecting female threaded pipes Made of stainless steel 316/316L for greater strength than steel 304 Low carbon content to ensure greater resistance to corrosion Meets standards ASTM A733, ANSI B1.20.1, and ASTM A312/SA312 for quality assurance