The NIBCO Press System copper extended female fitting adapter allows the fitting end to be pressed into a press fitting. Simply applying pressure from a pressing tool tightens the O-ring onto the tube, ensuring a clean, permanent, watertight seal in seconds, with no flame, solder or flux. The female adapter has a fitting end and female NPT thread. These fittings provide a method for adapting a fitting end into a press connection to a threaded connection.