This unique dripper has a flow regulator which can be set at 100, 150, 200 or 300ml/day. Ideal for delivering a steady supply of water, direct to plants' roots in pots, baskets or grow bags, indoor or outside. The three spikes give it great stability, whether you use the stylish 2 litre UV-resistant polycarbonate container it comes with, or use one of your own empty plastic bottles (a variety of adapters fit most bottles up to 5 litres).