Anvil 2139 Forged Steel High Pressure Pipe Fitting, Class 6000, Hex Head Bushing, 3/4" NPT Male x 1/2" NPT Female Hex bushing for connecting two pipes or with different diameters Male National Pipe Taper (NPT) threads on one end and female NPT threads on the other for connecting pipes with different ends Forged steel for weldability, rust resistance, and durability Class 6000 fitting for use in high-pressure applications Meets specifications ASTM A105 and ASME/ANSI B16.11 for quality assurance