The Pope Brass Universal Tap Adaptor has an 18mm male click-on connection and a female BSP tap connection for 20mm (3/4") or 25mm (1") threads. It screws onto a matching male-threaded garden tap and accepts an 18mm click-on hose connector.
The adaptor has a 25mm (1") female thread with a removable reducing adaptor for 20mm (3/4") taps. Leave the reducing adaptor fitted for the smaller tap size, or remove it for the larger size.
The brass adaptor stays on the tap between uses, allowing you to attach or remove the hose without unscrewing it.