Brass Bibtap 1/2" male thread Inlet Thread.  Thread On Outlet 3/4" BSP and a double check valve 

This is a standard 1/2" Bibtap that you would find in most domestic properties.  The tap has a 1/2" Male inlet thread and a 3/4" outlet thread.  This tap is a typical domestic tap.  The hose end connector will take a 12 mm or 1/2" hose or this can be replaced with a threaded tap connector so that you can use this with the standard quick click connectors