Prevue Pet Products 20 Oz Coop Cup - Heavy Duty Stainless Steel Poultry Waterer for Chickens, Ducks & Birds - Easy Bolt-On Design for Coops, Cages & Aviaries - Perfect for Backyard Farms & Poultry Keeping

The cup holder ring is rusting..... I trusted Prevue after I bought a $700 stainless steel cage from them. But seeing this cup fail has me questioning the quality of their products. Don't buy stuff that'll rust. It can kill your bird.