Plant it circular water timerThe PLANT! T Circular Water Timer can be used with mains water from a tap outlet or with a gravity feed system from a tank, water butt or reservoir. Simply select the time you want the water supply to be turned on and off, link up to your irrigation dripper line and the timer will do the rest. No plumbing needed easy to install and simple to use. The water timer is also weather resistant and has an auto safety valve shut off for when the battery is low