Anvil 2117 Forged Steel Pipe Fitting, Class 3000, Coupling, 1" NPT Female, Galvanized Finish Coupling for connecting two pipes with the same diameter in a straight run Female National Pipe Taper (NPT) threads for connecting to male threaded pipes Forged steel for weldability, rust resistance, and durability with a galvanized finish for a protective coating Class 3000 fitting for use in high-pressure applications Meets specifications ASTM A105 and ASME/ANSI B16.11 for quality assurance