The Perky-Pet Aster top-fill hummingbird feeder features new Push-Pull technology for effortless refilling - just push, pour, then pull-and-lock! It features an easy-to-fill wide mouth top and an advanced "sports bottle"-like function to facilitate replenishing the nectar. The four attractive asters on the base of this attractive feeder contain the feeding ports. With fewer parts, cleaning the Aster feeder is simple. The clear plastic reservoir makes it easy to monitor nectar levels in this 16 oz. hummingbird feeder.