Merit Brass KP411H-24 Stainless Steel 304 Cast Pipe Fitting, Half Coupling, Class 150, 1-1/2" NPT Female x Plain (Pack of 10) Half coupling for connecting and extending pipes Unthreaded (plain) on end and female National Pipe Taper (NPT) threads on the other for connecting different types of pipes Made of stainless steel 304 for strength and greater ease in welding than 302 grade steel Lower carbon content for greater resistance to corrosion Meets standards ANSI B1.20.1 and ISO 49 for quality assurance