Merit Brass KP611H-24 Stainless Steel 316 Cast Pipe Fitting, Half Coupling, Class 150, 1-1/2" NPT Female x Plain (Pack of 10) Half coupling for connecting and extending different types of pipe Unthreaded (plain) on one end and female National Pipe Taper (NPT) threads on the other for connecting different types of pipe Made from stainless steel 316 for strength Higher corrosion resistance than stainless steel 304 Conforms to standards ANSI B1.20.1 and ISO 49 for quality assurance