1x bird feeder（three heads）This hummingbird feeder eliminates airflow through the , and the one-way feeding hidden in the flower opens when the hummingbird inserts its to feed, then closes again when they leave!1. Choose a fun bottle that you want to recycle.(A bottle with a shallow bottom will also work.)Feeding valves promote oxygen starvation in the , which starves so lasts longer, helping your hummingbirds stay happy (and reduce your cleaning and maintenance efforts). Yeah!Because only the hummingbird's can open the feeding, uninvited guests won't hang out after they ruin your party!2. Make sure the feeder plug fits into the spout. (Avoid installing bottles that are too tight as it may damage the stopper).3. Check the bottom of the bottle to make sure it doesn't have a saucepan. Flat bottoms work best.