A garden tap is very useful for jobs such as cleaning the car, watering the garden, washing the dog and filling up the paddling pool. Apart from a 15 mm copper pipe and various joints to suit your situation you will need a stopcock, a non return valve the main, a drain cock, and a bib tap to complete the task. East London Plumbers install outside plumbing.Method.1). In one of the under sink kitchen cupboards use a drill bit 25 mm in diameter to drill a hole through the wall to the outside, at about the height of your knee and as near as possible to the rising main.2). Turn off the main stopcock run the rising main dry. Cut into the main at a point directly below the drill hole and fit a T joint.3). From the T joint (and running directly up the hole) fit a short length of pipe, then the stop cock, then the non-return valve, and the drain cock. Make sure that the arrows marks on the various fittings are all pointing in the direction of flow.4). This and now for the difficult bit, making a neat job of the various joints while at the same time ensuring that the pipes fit closely to the walls. From the drain cock, run a pipe through the wall so that it connects to the bib tap, and screw the tap securely to the wall. An East London Plumber will do this.5). Finally, having first checked that all the joys of dry, stuff the hole in the wall with a fibreglass roof insulation or foam, then squeeze silicone sealant in and around the outside end of the whole to prevent the possibility of water leaking through. And the job is done.