Parker 8-8 MHN-B Brass Pipe Fitting, Hex Nipple, 1/2" NPT Male X 1/2" NPT Male, 1.89" 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