Coolrunner Bottle Cap Sprinkler PVC Plastic Watering GB 28mm caliber Little Nozzle Sprinkler Head Watering Vegetables Mist Nozzle (12) Economical watering system Keep plants watered while you're away Fits most plastic water or soda bottles.Please measure the bottle inner diameter before use. You can combine water and plant food in a bottle then use the water spike to deliver the ultimate nourishing fluid. Garden watering device. These handy garden watering tools help deliver water where plants need it most.