Anvil 2154 Forged Steel Pipe Fitting, Class 3000, Socket Weld Coupling, 1" Female Coupling for connecting two pipes with the same diameter in a straight run Socket-weld ends for welding to unthreaded pipes Forged steel for weldability, rust resistance, and durability Class 3000 fitting for use in high-pressure applications Meets specifications ASTM A105 and ASME/ANSI B16.11 for quality assurance