There are 3 types of emitter. Drippers drip water directly to the root zone, over a small diameter. Sprays throw out fine jets of atomised water over a bigger area. Sprinklers throw heavy droplets over larger areas. Drippers with barbs can be inserted directly into the supply pipe, at the end of 4mm micro tube, or on a spike. Sprays and sprinklers will usually be fitted onto a stake, often with an extension piece or riser.