Frost and UV-resistant ABS plastic. Threaded 1/2" (12.7mm) and 3/4" (19.05mm) BSP female connector and quick fit 1/2" (12.7mm) male accessory connection. Converts 1/2" (12.7mm) male threaded taps to 1/2" (12.7mm) male quick fit connection. Also converts 3/4" (19.05mm) BSP garden taps when insert is removed.