Pet Aspects 384 Nectar Guard Tips. Nectar, Guard, Tips, Garden, &, Patio, Home, &, Garden, Items, Grills Supply Store/Shop Nectar guard tips - pack of 12 Tips easily slide on to the feeding port on the underside of the feeder cover The flexible membrane in the center of each tip easily opens when hummingbirds insert their beaks to feed and close up tight when beaks are removed Small in size Works with HummZinger Ultra and Fancy Hummingbird Feeder ONLY