Parker Stainless Steel 316 Pipe Fitting, Hex Long Nipple, 3/8" NPT Male X 3/8" NPT Male, 2" Length Hex long nipple pipe fitting for connecting and extending pipes Male National Pipe Taper (NPT) threads on both ends for connecting female pipes Made from stainless steel 316 for strength Higher corrosion resistance than stainless steel 304 Hexagonal shape for installation and disassembly with a wrench