Hozelock Flowmax 3-way Tap Connector:

The Hozelock Flowmax Three Way Connector allows two watering devices or hose pipes to be connected directly to one outside tap. In addition, it has a third, permanently accessible outlet that rotates to allow water to be directed into a bucket or watering can.

The connector fits most garden taps and is supplied with 21mm (1/2in BSP), 26.5mm (3/4in BSP) and 33.3mm (1in BSP) adaptors. It is ideal for use with automatic watering systems – controllers can be screwed directly underneath.