The Hozelock advanced pressure compensating drippers are for use in-line and always give 4 L/hr. water flow, regardless of their position in the system. The drippers are made from tough UV stable plastic, and have an in-built filter. They automatically self clean and automatically shut off when pressure is below 1 bar. Ideal for hanging baskets, troughs, growbags, borders, greenhouses, cloches and vegetable gardens. Use at the base of small plants, secure with a stake. Pack Quantity 5