John Guest CI320816S 3/4 Inch BSP Tap Connector for 1/4 Inch Tube
3/4 Inch Male Garden Hose Thread to 1/2 Inch Hose Barb
Onarway Brass 3/4 inch Male Threaded (OD 26mm) Adaptor, Garden Hose Connector, Copper 3/4" BSP Male Watering Fittings, Quick Connect to 1/2" Pipe and Garden Spray Guns : Amazon.co.uk: Garden