Tefen Nylon 6/6 Pipe Fitting, Hex Nipple, Gray, 1/2" NPT Male (Pack of 5) Hex nipple for connecting two threaded pipes or fittings Male National Pipe Taper (NPT) threads for connecting to female threaded pipes Nylon 6-6 for high strength and flexibility, abrasion resistance, and a higher melting temperature than Nylon 6 Working pressure of up to 200 psi Meets NSF/ANSI standard 61 for drinking (potable) water