Parker Brass Pipe Fitting, Hex Nipple, 1/2" NPT Male X 3/8" NPT Male, 1.7" Length Hex nipple for connecting and extending pipes Male National Pipe Taper (NPT) threads on both ends for connecting female pipes Hexagonal shape for increased leverage with a wrench during installation and disassembly Made from brass for higher corrosion resistance than steel NPT threads for creating tighter seals than straight threads