Anvil International 325 Steel Pipe Fitting, Schedule 80, Seamless Nipple, 1/2" NPT Male x 3" Length, Extra Heavy Black Finish Seamless nipple for connecting two pipes in high pressure applications Male National Pipe Taper (NPT) threads for connecting to female threaded pipes Steel for weldability and rust resistance with a black finish for a protective coating Schedule 80 fitting for a thicker wall than schedule 40 fittings and an extra-heavy design for use in heavy-duty applications Meets specifications ASTM A733 and A106 for grade B seamless pipe